I'm annoyed that people use the fact that this is not how life works to add more misery to a student's life, always intentionally forcing them into groups with people they can't stand just to watch them squirm. They BS like it's to help the students learn how to work with people they don't like, but I think it's pointless, and just gets in the way of happiness and progress. It's like saying, you know what most people in the world aren't happy, so we are going to make and keep you miserable just so you are prepared for the real world. It seems stupid to me. Also, I don't think having to work with people you don't like is as common as usually believed. I think it's an artificial setup that's beaten into students in the schools and then continued in the working world. That is, just like students keep getting put in groups with people they don't like, so does idiot management go out of their way to team people up with others they don't like. It's stupid, and instead of being supported and beaten into students until they accept that reality, it should be risen above, and students should be made to see that it doesn't always have to be that way, so that they don't accept that BS when it happens, and instead look for ways around it or for ways to avoid it. Also, it doesn't take that long to learn how to work with others you don't like, so once that's done it's time to move on to better environments where progress can be made without everyone (or the losing personalities) having to be miserable because they have to work with people they don't like.
I'm sure there will always be that person that will find a problem with everyone, and I'm sure there'll also be that person that just grates on everyone's nerves, but they aren't that common, and definitely shouldn't be who's catered to. People need to learn to not waste time with these people, and infrastructure should be setup so that you don't have to deal with them. Their behaviour is often encouraged and forced to be accepted at the expense of the group's wellbeing, and that's just stupid.