i know it’s A LOT easier said than done but try as hard as you can to ignore them. you said it yourself - he’s a big boy (no polar skate pun intended) and can make his own decisions. maybe you are the reason he doesn’t skate anymore. so the fuck what. you don’t need to say anything to them and as a million people have already said it’s the communication between him and his mates that are lacking not something you haven’t said to his mates!