I'm with Al, I don't recall you saying anything about brain injury or operations, etc. Had we known, the comment above may very well not have happened.
Yep, they're right, you haven't mentioned it. Now, to correct the awkwardness, you'll have to make light of the situation and make a joke about your own brain damage. Here, I'll make another joke about mine too.
I've read drinking and drug use can cause brain damage and memory loss. Even worse, they can cause brain damage and memory loss.
I think that FourSquare was trying to play for victimhood and trying to guilt me out. Wrong forum, and it's the wrong tactic against me. I am not one to say shit I can't stand behind or be guilted out by. Mind you now that it is exposed and looks like shitty but ultimately ineffectual game-playing, he looks like the horse's arse, that I have been implying he is, all this while.
Truth is, even if it were true, it would not have ultimately changed anyone's general assessment, good or bad about me, nor ultimately informed or changed my opinion or behaviour. This makes his tactics doubly stupid.