Clyde hates coffee. He thinks it tastes bitter and gross unless it has a shit ton of sugar and cream in it. But he has a crush on Tweek and wants to impress him, so he forces him to drink coffee until he develops a taste for it (more a tolerance and the ability to not make a face when he drinks it) so he can finally ask Tweek out for a coffee date. (Not to Tweek Bros, obviously. Far, far away from Tweek Bros.)
He’s worried Tweek would judge him for liking “white coffee”, but Tweek lets him know there’s no shame in sweetening his coffee since it’s what most people do anyways. But he thinks Clyde makes the cutest faces when he tried to drink straight up black coffee.
Tweek buys Clyde “fancy” creamers (read: international delight/flavored) after a few weeks of dating.