If he wants to make a point about artists having a social responsibility to accurately portray reality, he should've just said sitcoms are a reactionary genre and artists with a desire to produce revolutionary work ought to not be involved in the production of sitcoms. Because sitcoms make most of their money through syndication, reaired episodes aren't shown in order. This means sitcom episode always reset to a status quo, which means you'll never be able to portray the effects of lasting change. From this, a school shooter episode wouldn't work because the following episodes would all have to pretend a school shooting never happened, and while that could be used as a commentary on school administration, even the characters would have to pretend the school shooting never happened.

This is what I meant earlier about him being a pseud. I don't know if he's genuinely this pig-headed or if he's just purposefully being edgy, but the effect is still the same.