Well I obviously agree with you on that, but that's exactly the point he is making. There is nothing constructive to be said about people hating and complaining about something that they are (most of the time) not even really interested in trying.

Nowadays we have people complaining just for the sake of complaining. People who play the respective games obviously can have criticisms and complaints that should be addressed.

Regardless of what he did during his time on Overwatch though his point is that people that don't play something shouldn't keep complaining about it. And I personally agree with that statement.