AITA for attending my son's basketball game?

I (M35) have a son (M12) named Antoine with my ex Rhonda (F35). Rhonda and I got divorced about a year back and it was a very acrimonious divorce, with Rhonda coming for full custody and wanting me to have as little visitation as possible; thankfully, I was able to get weekends so I have a good amount of time with Antoine, but Rhonda's done her best to make sure I don't get a second with him outside my allotted time. Last week, Antoine's school basketball team was in their district championship and Antoine called me to say he wanted me to come and cheer him on. I said I'd be happy to be there and during the game, kept to myself until they won and I went down to hug Antoine.

When I did so, Rhonda saw me and started yelling at me for coming when she didn't say I could. I tried to calm her down by telling her that Antoine wanted me to come, which he confirmed, but Rhonda didn't budge and told Antoine that he doesn't get to make these sorts of decisions because he's just a kid. I then sent Antoine off to celebrate with his friends so he didn't get sucked into the argument and Rhonda and I argued for a while about how she's trying to keep me from seeing my son.