I guess the key quality of the best humour is that everyone can see the humour in it; at least appreciate the joke even if they didn't agree with the underlying point. At best it makes them rethink what they previously thought about the topic. Much of what is offered as humour online (and also mainstream television) is theatrical rage, which generates laughs and applause (a.k.a. 'clapter') from people who already shared the rage, but to those not already on side it just falls flat. That seems to me what's going on here.