Would you tell your child to stop being petty?

I have full guardianship over my God son. He is 17 and he's openly gay. We had some bullying issues the last two years. This girl and her friends were being very mean and homophobic towards him. Funny thing, about a month ago the bully girls boyfriend dumps her, starts dating my God son, then they broke up after two weeks and he's back with his girlfriend. Bully girl. But it does sound like they had sex and my God son already knows safe sex for same sex couples. Well the petty in me and the adult in me are fighting over my feelings over what my God son did. My God son wasn't heart broken over the break up. They dated for like two weeks. But my God son likes to kind of panhandle. He will go downtown and play his guitar or piano and people will often put money in his jar. Well. What he did was he playing his piano with his mic which is pretty normal for him, but where downtown he put himself was across from the girls church at this little hipster cafè and the people at the church were outside doing something. Girl was outside. The song he chose to sing and play on the piano was taste by Sabrina Carpenter. It's the song that goes "Heard you're back together and if that's true, you'll just have to taste me, when he's kissing you. If you want forever and I think you do, just know you'll taste me too." I love Sabrina Carpenter and I took him to a concert for his birthday. But that was clearly intentional and the adult in me feels like I should tell me come on now. Be the bigger person. But the petty in me loves it. Should I talk to him about being the bigger person because from what I heard he did piss off bully girl