$3/$5 NLHE $300 buy-in. Table is playing nice and loose/passive. Most pots aren't raised pre-flop.

BB is really loose and passive. Way over-plays strong hands with absurd bets. Seen shoving flop with nuts, opening AA and JJ for $100 from EP, etc. We both have just over $400.

I have Tens UTG and call, 2 players limp behind.

~$20 in the pot.
Flop is :Ac: :Qh: :Ts:

Checked around because I suck at life.

Turn is

BB leads for $20, I raise to $60, folded around, BB quickly announces that he's all-in for just over $400 or so. He's happy and I really don't think he's bluffing. How sick is it that I want to fold?