Is it normal my girlfriend prefers I call her hot over beautiful?

Yeah it's normal... Everyone has a preference.

Seems odd to me, but i like to consider myself a gentleman

Does it matter if it's normal? You could call her Bozo, if that were her preference.

Then do it and quit thinking about it. Your the one that started calling her hot after all, so it should not even be a question.🧐

Just keep the lassie happy.