Great point, and I agree that it sucks that low-effort "serious" comments are more tolerated than humorous ones. But I also think disallowing jokes has a "chilling effect" that ultimately encourages a greater number of people to either think before they post or not post at all. It's not perfect, and of course I'd prefer if low-effort comments vanished regardless of their tone, but it's waaay easier to get away (or even become a celebrity) with extremely low-effort comments on Reddit, low brow or not.