In middle school, there was this one super unpopular girl that gifted me acne medication for Christmas.... Unprompted. We weren't even friends and yes, I had acne problems like most teens did.
I never bullied anyone in my life before and since, but I did that year.... This was why she was so unpopular. The year after, she called 1 of the 2 only black kids the N word, got her ass kicked and either removed or expelled from school.
I have no idea why anyone would go around picking fights, especially with no friends to begin with. Before anyone asks, no, no mental health issues.
Edit: I also wasnt "popular" and had very little friends too. I mean, it wasnt right either way to turn bully either but I was young