65s

It is not ok to call. He is 4x 3betting you.

Agreed with nitrol. Just give it up here pre-flop.

As played, I think I'd try to check this hand down, so checking flop.

I agree with folding to the 3bet preflop. If I would ever consider calling this, I think the better target to do so will be tight opponents because you will have better implied odds for chasing your draws on the flop. Adittionally, they will mostly have big pocket pairs and high broadways, so if mid to lower cards come on the flop and you hit it well, you can be pretty safe that the opponent didn't hit something better. Furthermore, tight opponents could sometimes give up more easily postflop, so you could try with semi bluffs on the flop against those.

I think the best way is fold to the 3bet preflop.