Not to let ex DH take DS to a concert.

[MissingCalifornia]

I saw ex, we only parted ways three weeks ago so I’m prepared to be told that is clouding my judgment.
Today is DS’s birthday and he was gifted concert tickets to an act that I find inappropriate for his age (he’s 13) by DH. STBXH knows how I feel about this act so I’m pretty sure the whole thing is to undermine me and put me in a difficult position.
I’ve said to DS that I need think about him attending the concert which has spoiled his birthday lunch with relatives as he has sulked the whole way through it.
AIBU to stick to my guns and not let him go?

I agree that he'll be fine at a goth gig. I wish my kids would come to them with me. If you say what band, some of us may be regulars at their gigs and can put your mind at rest.
I've been going to (mainly goth) gigs for the last 35 years or so. I can honestly say there has never been any trouble at any of them.

Would it be ok if an uncle/godfather/family friend wanted to take ds to a concert as a birthday treat? If so, I don't see why his stepfather taking him is an issue. Assuming there isn't going to be a dripfeed about abuse or some other serious issue, I think at thirteen, ds is old enough to decide for himself if he wants to maintain a relationship with his [ex] stepfather.

She's already stated she's not happy with it. No, is no, so no disagree Bertrand she's his DM and absolutely doesn't have to justify herself to him

She can have the convo with her DS, how confusing for him and horrible put in the middle of this by SD!? He's aware she's set a boundary for her DS and he's walked right over it so why are pp still asking who the band is and whether it's appropriate.

No is no. To then try to argue it is abusive