Hi Oreo-

I agree, you need to call this down once 3-bet. Lots of decent/solid buttons would do this with exactly JTs and sometimes T9s. It really smells like an overpair, but I can't fold top pair to an overpair in shorthanded once a pot is heads up.

Assuming the turn isn't something scary, I probably call down if that's where the raise is as well. If it's a king or an ace, though, I consider folding after getting raised. I probably fold, unless the button makes too many moves.