I usually answer questions nicely but I find it difficult sometimes to react nicely on videos that show really bad stuff done by someone who calls her/himself a professional. But I'll do my best to just explain clearly why I don't like it. And maybe try to ignore it more when someone only makes an account here to tell us how jealous we are of dancers we don't like
The problem is my "ignore mode" is something I often use in real life because I can't come up with good answers so quickly. Here, I can think longer about my post and I can defend myself better, so I often do that when someone accuses me or another forum member of being a jealous b*tch just because we said some professional doesn't dance like a professional...
However I'll try to make more obvious constructive criticism.