Jinx hates baths too, I found it easier to use the tub than the sink, it gives him a little room to move and doesn't get as messy, he's been much better about it since I started using the tub. Afterwards, he'd get sulky too, I give him a treat, dry him as well as possible with a towel (the blowdrying was way too traumatic), give another treat and let him out of the bathroom. Then I go wherever he chooses and just sit on the floor near him. He'll glare for a few minutes, but usually he comes over and gets right in my lap. If I let him just go off by himself, he'd be sulky too. I just stay near him but don't force the issue.