For me, I always think about everyone's type. >.< I mean, not
everyone's, but I find myself talking to someone in a store or in class or something and wondering "Hmmm, well they seem like a J..." or "Let's see, I'm definitely getting some Ne from them..." I just can't help it sometimes. But for me, I don't see typing as taking away from people. I see it as adding on to them. Like, if you identify someone's type, you can either think "I'm taking away other possible characteristics," or you could think "I'm adding on characteristics." For me, I don't ever think knowing more things about people is harmful. I mean, unless it's a bad thing.

But there aren't bad types, so we're good there. But like, if your friend tells you their favorite music genre, you don't think of it as restricting. You think of it as adding more dimension to them.
typing someone is some what an invasion of their privacy
I can see what you're saying with this, but I don't think it's invading anyone's privacy to take what you already know about them to infer more. Like, if someone is actively trying to hide something about themselves-- like if they're really insecure about their brown hair, and it reminds them of their abusive uncle who also had brown hair

so they dye it blond or something, and then you find a box of blonde hair dye and start snooping into their past to find out what their real hair color is... I'm trying to give an example of how learning about someone would be an invasion of privacy, and it's a bad example, but I hope it makes sense. If someone's trying to hide something, it's not your right to dig deeper behind their back. If you just notice things about someone, though, things they're not trying to hide, that's not invading their privacy. Like, most people don't try to hide that they're an extrovert or a feeler or whatever, so it's not rude to acknowledge it. Or like, one of my sisters, the one who introduced me to MB in the first place, types herself as an ENFP. And even though sometimes I doubt it, and I
really think she's more Fe/Ti than Te/Fi, I kind of feel bad digging deeper into it and analyzing her and stuff, because I wouldn't want my siblings questioning my type behind my back. So I guess I think it's a different story if someone's already decided what type they are. If they have, then you shouldn't question it, even if you think they're wrong. If they haven't, though, I don't think it does any harm to figure it out for yourself. And I admit, I do sometimes think about whether my ENFP sister is really an ENFP, but the reason I think she's not an ENFP is because of the functions, but she doesn't know hardly anything about the functions. It's not like she's telling me she's Te/Fi and I'm just ignoring her, you know? I think if she did get the functions, she'd probably agree with me. That's the difference, though, that's why I think it's okay sometimes and not other times.
he said something to the effect of I never leave people and instead of really appreciating the true meaning of these words, the fact I knew he was an ISFJ and ISFJs are supposed to be loyal
It sounds like this is a problem of assuming too much about someone because of their type. Like, giving in to stereotypes and stuff. You know what happens when you assume, right?

When I type people, at least, I almost never accept it as absolute unless I've talked to them about it and they agree with me. Even my sister, who I
really think is an ESTJ, when she read the description she wasn't really sure it was her, so I respect that. We both agree that she's ExxJ, and the Ne is just so obvious. She's got a lot of Ne.

Sometimes I do wonder if maybe she's an ESFJ, because I do seem to get Te and Fe mixed up sometimes. :\ But I don't think I did this time. And sometimes I wonder if I got it wrong just because sometimes the Ne is just so much and so obvious, like she's like NEEEEE and I'm like "ugh am I
sure that's tertiary?" Especially because she's only 17, she shouldn't have so much of her third function, right? Anyway, I don't like to ever think of someone's type as set in stone, and especially not without their input, so I don't assume characteristics specific to their type. Like, if I guessed someone was an ISFJ, and then they said "Yeah I'm like super loyal," I wouldn't think "Uh yeah duh cuz I already think you're an ISFJ," I'd probably think "That's cool to know, and reinforces my idea that you're an ISFJ." And like, if I thought my friend was an ISFJ but didn't know whether or not they were loyal (well, for one, loyalty doesn't really determine type,) but also, I wouldn't just assume they were loyal because they were an ISFJ. I'd just leave the loyalty thing a question mark until it was confirmed or denied, and then use that new knowledge to reexamine their type.
it spoils the fun of getting to know someone later on
Like I said, there are so many other things that go into someone's personality, and there are so many things that can't be determined by type. I know it sounds stupid and cliche and stuff, but everyone's different and special in their own way.

I think if you think you know things about someone that you really don't, just because of their type, then you're doin' it wrong.
Guys, I just realized I've been working on this post for hours.
Literally.

I need to learn to shut up and just post already.