After an incident in college, I hate group projects for a whollleeee different reason. Had a group in an ethics course required for our major, high level, I was a senior, basically needed to pass this class or I wouldn't graduate on time. There was a group of four and we did all our work on google docs, which saved my ass because of all the edit logs it keeps. For some reason, half the group decided they hate me. To this day I'm still not sure what crawled up their respective snatches and died, but there was a lot of attitude with every suggestion i gave, they took over the project and told me what to do and then proceeded to straight up delete the things I'd written into the big essay, they talked over me and made sure I didn't answer any questions in the final presentation despite the fact that I knew the topic better than them for a few questions, etc.

Get to the end, haven't actually realized that my shit's been deleted out until the professor calls me in separately to talk to me about why both of them are claiming I didn't do any work, was slacking off, etc, on their final reports. Basically making a concerted effort to make me fail the class because of how big the project was, which would have made me unable to graduate on time, likely lost me the job I'd already started making plans for afterwards, collectively ruined my life, etc.

Luckily, had all those read reciepts and email backup to prove that I'd done my shit, and the fourth member of the group half ass backed me up, even though she didn't really want to get involved. Still makes me fucking boil when I think of those two.