Steve probably didn't say anything because what Belotti said wasn't that insulting. Steve asked a question and Belotti gave him his opinion. The End.
In fact, if you listen closely Belotti compliments Cam as well. Says he seems to have come around this year and that he is a big, strong, tremendous athlete and things come natural for him. He then also tells Steve "I'm just saying this but you would know because you are out there playing (with him)".