started to like someone and he made a sexual joke

I don’t know how react at all I get that they’re getting comfortable with me but like is it necessary to say that 😭 We’re joking at first talking random stuff and suddenly he made a joke which I was confused at first, I didn’t get it but then I did. It made me turn off a bit since cause I don’t really like someone which I start liking romantically then they made a master bait joke