You've got to be kidding. You were barely even a favorite to win. Not only was this not "insane," but his play was almost unquestionably correct.
This was no more a bad beat than AK beating 55 in hold'em.
http://twodimes.net/h/?z=646255
pokenum -o ac 2c 7d 6d - qd qh 4h 3h -- ah 7s 2h
Omaha Hi: 820 enumerated boards containing 7s Ah 2h
cards win %win lose %lose tie %tie EV
Ac 2c 7d 6d 460 56.10 360 43.90 0 0.00 0.561
Qd Qh 4h 3h 360 43.90 460 56.10 0 0.00 0.439