Is this considered PDA even if its after school?

Ok so my school was having a faculty vs. Students game AFTER school. My girlfriend and I went to it and I kissed her on the lips twice. The teacher who was announcing the game yelled at us over the loud speaker and so everyone knows now. But that doesn't matter I can deal with that. The part that pisses me off is that today my girlfriend got a in school for kissing me. Im probably going to get one tomorrow but my question is, is kissing her still PDA even though its after school? Thanks because im really pissed they're giving us inschools. Oh and neither of us have had detentions or anything