I agree he doesn't do nuance well, but most of the great philosophers don't. Philosophy is a seer stone through which to look at the world...it gives you only one painting of it. If you look at him in the philosophical context, it makes perfect sense.
p.s. cheers relentless mocks classism and lumps people of various classes into this one setting. Clavin is a caricature of a lower class person who could never hope to rise to the station of an intellectual. It contrast with Frasier who is a pompous and elitist windbag. Yet, as Diane points out in her play on Frasier, they are all lost souls who wallow their sorrows and (from what the writer's clearly let us know) pathetic existences (whether a rich barmaid forced to be a barmaid or a washed out baseball player) in drink and fellowship. The thing they all have in common is they are losers.
p.p.s. it's one of the reasons why Cheers stopped working once Diane left beyond the will they or won't they. Kirstie Ali's character was just blatantly contemptuous (at least at first) of the bar residents. The quiet part began to be said out loud and it didn't work.
p.p.p.s a better mocking of me would be Frasier. Indeed, my two brothers were known as the "Crane boys" back in law school