Would you say something to the mom or just stop attending?

So we started a church home group so we meet in smaller groups in a hosts home for while covid was preventing the church from gathering and we went for a few months there was a single mom, her son and her mom/his grandmother. I’m a single mom myself as well so this was something I hoped would be positive. My son (4) started doing “booty taps” and said the boy showed him that on his tablet when they were supposed to be watching the children’s ministry video and it wasn’t terrible but certainly not appropriate. We went again to a life group and I had a bad feeling and went to look for them in the middle of our meeting it was a burning “there’s something wrong” feeling, they were fine just playing but as we were about to leave my 20 month old was curious about the boys feet (hes 7) and the boy pulled them away and said stop, naturally my son became more curious and the boys says “you’re pissing me off” I just said that’s not a way to talk to someone and if you need help because he’s not listening get an adult. He just gave deer in the headlights look and we were already leaving so I didn’t say anything to mom. What would you do? I don’t think we are going to go back. Then church itself has questionable practices that I’m unsure of.

Editing to add: we are for sure leaving this church, just trying to figure out whether to mention it to the mom. As a mom, I would appreciate knowing but it also may be pointless.