These are all really good points. There's much to learn from people who are in the middle of being crazy, because it speaks to who we are as human beings. But after you have the basic tactics of human craziness figured out, it gets a little too obvious and repetitive and wastes time on stuff everyone should have figured out. The drama bewilders or engages a lot of posters into going over already-resolved-for-most-people, age-old issues, when the group really should just invest their energies into moving that person out of there in order to foster more productivity.
When people just start attacking each other, or each others' "types," whether that be a Meyers-Briggs type or any other broad category of people, it halts all progress on a particular thread's conversation and diverts the flow of attention to drama that typically has street-harassment-level "insights" that are grandiose enough to cover up a narcissistic injury of some sort, followed by all kinds of ego-defense mechanisms. I'm okay with both of those things and certainly don't feel above those things, because they're things we have all experienced within ourselves at one point or another and to one degree or another. And we need them! But since we all deal with them, it gets a bit obvious. It gets annoying when people engage in those things when they could be investing in making more in-depth responses that build on a foundation of long-accepted principles. And the thread, no matter how interesting it might have been, begins to devolve into a ridiculous slap fight. Someone who might have had something interesting to say is inhibited from posting. One or both parties involved reveal their weaknesses and their irrational, ego-driven motivations by losing their tempers, and it usually just ends there with both sides thinking they're right and a couple of white knights hanging around the side lines.
It's predictable and tedious... we know that will happen every single time, yet we just let it keep happening over and over again with the same tiny minority of people who haven't figured out their shit. Again, we've all struggled with not having our shit together, but in real life, we tend to face some really serious consequences for it.
I think that creating total ignore functions would cause more drama that it would resolve though, so I don't know what the answers are to things like this.