Im a new player so maybe my opinion doesn't warrant an answer. However, this is an easy one for me to answer myself!
I would of called his all-in bet, why are people saying fold at this point? If i got re-rasied preflop, with Ace-King i'd of guessed (if early in tournaments) he either had AA,KK,QQ or bluffing
of course. You called, i don't think i'd of called, i think i'd of tried a re-raise again, should of had him put down 88's, however micro-limits i see people will go all-in preflop with as low as a pair of 2's hoping to flop trips..
After the flop, you couldn't of got any better (well obviously Ace instead of 8, but thats highly unlikely!)
Anyway, your hand was unbeatable (I would of been very confident to call any all-in bet at this point)...i'd of never guessed he had the trip eights when you got put all-in. Maybe possibly a King-queen... definitely not king-8 preflop with being re-raised unless you're playing a complete idiot.. You had best hand at this point and highest kicker. For him to go all-in like he did, i'd of guessed either complete BLUFF or he also had Ace-King..very easy call indeed!!
You played it well and he played it bad in my opinion and got very lucky indeed..
You was very unlucky