Is this punishment a little too far

I can't tell if I'm being a passive mom or not. I have two teenagers with my ex husband. My 15 year old wanted to go see a concert and his dad bought the ticket. I don't remember which concert. Just knew he would be over his dads house an extra weekend so he could go. My ex found out and let me know that our son found out another boy who is friends with one of his other friends likes Sabrina Carpenter and since finding out he said some very homophobic things towards this other kid. I planned to talk to him when he got home but my ex took things and step further and made him go buy I'm sorry gifts for this kid to apologize in person which I can agree with. What I don't agree with is my ex reselling our son's concert tickets so he could buy the other kid a ticket to see Sabrina Carpenter. Our son was already forced to be embarrassed and apologize with a gift back to this kid in front of his parents. Taking away something he was looking forward to I feel was a little far. My ex said he paid for the ticket so he can resell it if he wants to. My kids dad was bullied horribly in school and he almost died to suicide so bullying is a touchy subject. I think he's maybe using his trauma from bullying and pushing it on our kid a bit but tell me what you think