I don't have any issue with it if they the kid was otherwise clear of incidents in his life. No clue if that's the case though...
From what I've read she has said he was shot-down hitting on her or something, and then Mixon was saying derogatory stuff about the leggings kid or her other friend's s e xuality...He says she was saying a whole bunch of racist stuff.
If she was, and you believe him, and she went all-in for a fight, Mixon still messed up big time, but I don't know that I would kick him out of school if it's his FIRST incident. If the leggings kid hit her, and she knocked him out, we'd all laugh at the GIF. Hopefully everyone is better off for it...although I doubt it. A year suspension seems about right.
Hate these cases though - her story is just as likely as his to be true.