A good sense of humor is when you don't judge other people for their jokes, even if you don't find it funny. Nothing ruins a joke more than making everyone laugh, but that one guy who doesn't think it's funny just crosses their arms and stares at you.
And I'm not talking about insensitive jokes here (like racist, blonde, yo mama jokes ect.) but genuinely funny jokes that everyone thinks is hilarious. All it takes is that one sour-puss to ruin a whole mood.
THAT is truly what a good sense of humor is (imo).
Sonic the Hedgehog fanboy over here. However I don't follow the fandom. Those guys are animals.