This is a difficult one, and your DP is an arse for the way in which he's expressed it, but I do think partners should be able to express a preference on stuff like hair.
DP prefers me with a beard. All her celebrity crushes are beardy, and most of her exes had one. She just has a thing for bearded men.
To be honest, I was kind of over being beardy about 10 years ago, and have shaved it off a few times. DP has never complained, but there's definitely a inverse correlation between her levels of affection and the amount of chin I've got on show.
Personally, I'd prefer the woman I want to spend the rest of my life to continue to find me attractive, so the beard remains a fixture.
On the flip side, I'm not a fan of tattoos. No issue with them, they just don't do anything for me personally. So I'd probably be a little upset if DP decided to just go ahead and get one, knowing this. Luckily for me she's got a massive needle phobia so it's never going to be an issue!