When to push or call against an All-In specialist?

[Texter]

Down to the final 5 of a home tourney (20 players), top 4 get paid. 40%/30%/20%/10% payout.

I have a stack of about 5k, the big stack has about 12k, the other stacks have 7k, 4k, 3k.

Anyhow, the 4k stack is on the button when I'm UTG and he proceeds to go allin every time he's on the button, the big stack is in the big blind and let's this guy steal the blinds over and over and over. I get crap cards UTG so can't really do anything.

Eventually, I bust the small stack and now have about 8k and am slightly the small stack now.

Mr. Allin is now going after my big blind everytime...and I continue to get garbage. I consider calling with 10c2c, but don't.

Eventually I have to call with Qd3d and lose to a straight.

So How should i handle a guy like that?