BB announces he's allin no matter what

[Noir_Desir]

deep in the 3+R on stars, blinds are 2k/4k. BB has around 60k. I am the SB, having around 33k. BB announces before the hand that he has to go to work and will move in no matter what. Folds around to me, i have 89o and would normally push.

2 questions: Is this an angle shot or acceptable behaviour?
Do i push anyway? No reads on opponent, other than he's pretty tight.