Should I respect this donk all-in??
Titan Poker 0.10/0.20, hand converted by the iPoker Converter at Talking-Poker
saw flop | saw showdown
Button ($8.34)
SB ($19.87)
BB ($20.51)
UTG Hero ($24.00)
UTG+1 UTG+1 ($12.30)
MP ($20.08)
MP ($20.07)
MP ($9.60)
CO-1 ($36.62)
CO ($3.98)
Preflop: Hero is UTG with A♠ A♣
Hero raises to 0.80, UTG+1 calls 0.80, 8 folds.
Flop (1.90) 6♦ 7♠ 4♠
Hero bets 1.40, UTG+1 moves all-in for 11.50, Hero calls 10.10.
Turn (24.90) 2♦
River (24.90) 4♣
Monster overbet here 
U have to call, he could easily have an overpair or a flushdraw.
I think you will lose this very often to 2pair, like 46 or 67, or the made straight with 35. Disgregarding whether or not they should have played preflop, they just do, then jam the flop, daring you to call.
It could also be draws, like 45, or two spades, or complete air.
Mostly I'm folding here, there is little to protect. The way he has played, it doesn't matter whether he has you beat or not. The information you get about him from calling is irrelevant, he isn't going to be around long enough for you to make use of it.
EDIT: This is all true for unknown. If he is a fish who likes to dump his money over and over again, of course call.
