I don't know about just giving up and accepting that this hand can't be folded. If the grest players can fold K/K when they feel they are beat, if they can fold A/A under the right circumstances, then really calling this hand isn't all that automatic.
I'm not saying I could fold this hand in your situation, I've had sets beaten by over sets many times where I wish I had. Most of the time you don't see it comming, but if you have a 75% read on this guy and you put him on A/A for an overset Well could a great player make that laydown?
I don't see the whole hand history here but from what you've posted your only invested 800 and have 11200 left with the blinds only 100/200 survival is most important. You got to see the flop, you hit a set but this guy goes all-in in front of you with you suspecting that he raised with A/A.
Could a pro, could a great player fold that? I think the answer is yes.
Could I do it, I hope someday that I can get that good a read and lay it down if I think I'm beat. It's early in the tourney I'm ahead twice the average stack and I can pick a spot where I'm the aggressor. Survival is key to winning and awexome laydowns is part of that.
It's a freeroll though, some people play pretty wildly and it's still early it would be pretty damned impossible for me not to call, but I think under those circumstances in a WSOP
or WPT tournament a great player might be able to fold it.
Tough beat ... good game!