system
A chat on subreddit /r/NoStupidQuestions
human
Not always the same guys, Ive even had girls that do this crap, but I can't fight back, because they are girls. But that's besides the point, running is basically not an option at all.
gpt
You can fight back. You do have to make sure you use appropriate force, don't go overboard if you don't have to.

Pick up a martial art and protect your head. Bones heal brains not so much.