Take on an aggro blind defender HU with 2nd pair?

[mack848]

I decided to play a few thousand hands one tabling 5/10. Blind play seems to be much more important here than lower. I came across a TAG last night who strongly defended any time I raised 1st in in late position (he was 15/11/3). A couple of time he had pushed me off a hand when I was stealing and another time he flopped a set of Tens when I had QQ. Basically, he thought he owned me (probably correctly!).

I have A7o in SB, Villian is BB.

8 folds, I raise, BB 3 bets, I call.

Flop J76r

I check, BB bets, I raise, BB 3-bets

What now?

I want to take him on. I have 2nd pair/TK HU. Is this the time to make a stand - or meakly fold and wait for a better time?