staff tries to be vigilant about removing/infracting instances of typism, but its a large forum and we don't see each instance every time.
i'll agree that there are some unflattering stereotypes about types (and some types more than others) that are casually tossed around in online mbti culture. there are types that are stereotyped as more "intelligent" (even though there are clear cases of individuals of that type not even being very intelligent).
intellectualism is valued in online mbti communities for various reasons: its the internet and everyone has an opinion and thinks they're a genius, plus mbti is theoretical and involves abstract thinking. because of the stereotypes of some types being more 'intelligent,' other types will sometimes be the butt of a joke, marginalized, or at worst, you have really ignorant people with a chip on their shoulder looking for a 'type' to blame for their troubles (for example someone whos socially awkward in the workplace resents a person who has it easier, and their ego gets wrapped up in this whole "well i may not be charming like you but i'm a supergeniusmastermind and mbti validates me with these four letters." probably not, but thats what the ego needs to believe.)
i do wish it was easier to educate people on what typology -actually- explains. just because a person has a preference for Fe doesn't mean they can't use their Ti well, they're just more focused, more often on the Fe emotional atmosphere for example. They can also use their Ne, they're just, again, primarily focused on whatever their leading functions draws them toward. there is more going on in there than "sf" "nf" "nt" "sp." we are different combinations of all the functions, and i believe that it takes all the types to play different roles, in order for a society to work. if we had just a society of all "superevilgeniusmastermind introverts" then we would be more limited as a whole.
typology has nothing to do with actual intelligence, and even if some types have an inclination to focus on intellectualism, you will still find that some of them simply aren't that smart to begin with - no matter what their lineup of functions. type is not what you do, but how you do it, and its not how well you do it, either.
anyway, i do see what you're saying, but all we can really do about it is try to educate others on what typology really explains, and handle offensive posts where they say something ignorant about a type.