More like you can't say "I like you" because all they talk about 24/7 is how no one will date someone their height. You would practically need to give a sworn affidavit that you didn't care. They don't let you avoid the issue by talking about anything else at all.

It becomes a case of "No one loves me because of my big hairy wart. Want to see my big hairy wart? Let me tell you how many hairs it has. I've actually named all the hairs. This grey one is called George. It's vastly uglier than the other hairs because it's grey..." Ad nauseum, making it absolutely impossible to go "My, what lovely hands you have. Gosh, that's a terrific jacket and it really goes well with your eyes. Want to have coffee sometime?"

They basically insist you love their wart upfront in a way that just makes the entire thing a non starter no matter how hard you try to avoid the topic of their wart and focus on other things. No, their wart is their entire dating identity and only someone with a wart fetish could possibly figure out how to work things out with them.