Should I be mad or annoyed?

Do I have to revoke my feminist card if I can't decide?
Scenario, I'm looking at a lil football game. Having a convo with a guy that accused me of being too good to talk to him our entire 4 yrs at college. I told him u never spoke to me either and he's like well I gave u the head nod a few times. I shook my head I was like ummm maybe I missed it but it was cool and all in fun etc it was accusatory but not hostile. Unbeknownst to him I knew his first and last name and even had a nickname for him CCB - Chocolate Charlie Brown....needless to say he's black and has a big head shaped a lot like Charlie...he was on the school soccer team and held some sort of student office.
Anyway so I'm there talking shite with him and my two friends when a ball hits me on the ass. Mind u its not the ball from the game random ppl are just playing with balls since there are extras. Basically I ignore it and continued talkin didn't even turn around. I don't stop midsentence but I lean my head to the right and start to touch my right ear (in Taj language that means I'm uncomfortable). Now I realize its being done on purpose. I turn around I see a group of male friends (friends being used loosely I only see or speak to them on Fridays when I'm here and had a small crush on one 5yrs ago but that died a swift even aborted death). So I smile shake my head and brush it off and continue talking. The ball "missed" and hit my leg so now I just take my left hand and spread it over my ass (well obviously not the entire thing its one hand) to stop the ball from hitting it and making it jiggle. Jiggle you say and I glare back and say yes only because I had on sweats and not jeans. Finally I think whoever(s) doing it gets the picture and the "friend" comes across to apologize saying it was his associates and he was trying to get them to stop looking at and assaulting my ass. Then he goes amiss saying that they/he was just testing the bounciness for future knowledge. To keep the peace I did a lil chuckle and they couldn't tell that I was a lot angrier/confused than I let on.
Anyways I was like aight cool and I'm wondering if I should be mad, if I should have made a stink about it. I'm the kind of person if you do a grab and go in the club best believe you gotta have quick hands cuz if I know who did it they are in BIG TROUBLE. So what makes it ok if a friend does the same to u. In one case you read it as disrespect but if a friend does it its okay?