In overall, a good guideline for life is not to care what anyone says about anything in the internet.
And I think there are at least as many positive posts about INFPs as there are negatives. And these posts about INFPs don't really say anything about you. It's just talk about a category called INFPs, not you personally. And every type has its annoying and unlikeable sides, not just INFPs. There are a lot of people I don't like so it's okay that there are also people who don't like me regardless of type. Who cares if some INTJ/ENFP/AJDN in some forum don't like INFPs, it affects your life 0 %, unless you let it.
I do think I'm likeable and lovable. Lucky are those who get to live with me.