I think my biggest issue with typing here, is the severity in which people use it to base their opinions on. Yes, there will be some commonalities between those that say they're of a certain type, yes if gives you a fair idea of how someone MIGHT process information based on their type.
Crazy is crazy. Emo is Emo. Angry is Angry. Yadda yadda. I has nothing to do with type. If a person is unhealthy, they're unhealthy, their behavior isn't specific to one type. If the person is happy, and ambitious, their behavior is not specific to one type. If they have certain hobbies, they're not specific to one type. And yet, people seem to be constantly making these assumptions; and basing a LOT of what they believe about people in regards to behavior, on type. What drives me insane is when people excuse certain things because someone is of a certain type. " oh, yeah, that's common for ___". This leads to generalizations and even dismissal, if not, enabling, of stupidity.
To me, the idea of type theory is sort of like having a trichotomy of barrels of fish. Small, medium, large. Just because you're getting a medium, it doesn't mean its going to weigh exactly the same size. It only gives you an IDEA of the possible measurements available for that specific option; that if you get the measurements right. In regards to size, which is a fairly simple and static thing, in comparison to the human mind/behavior, which is a very complex, contextual, and ambiguous thing.
Don't get me wrong, I like type theory, it IS interesting, but at the same time, you have to be careful with how invasive you allow it to be. This doesn't mean that I, myself, don't make stereotypical remarks all the time. It's actually one of my favorite things to do, but not because I believe it, but because it makes me laugh.
That's my general opinion.