Should my opponent have resigned.

I was black.

Another pointless resignation thread...

I agree. Nobody owes you a resignation. Checkmate them.

I think this is more 'he resigned, and I don't know why.'

Good point, didn't even look at the position.

Yes, it is.

http://www.chess.com/echess/game.html?id=53631288

I was surprised my opponent resigned here. I mean, he's behind but I'm no master, I don't think it's a hopeless position, only 1 pawn down.

Seems like white is in trouble, but I don't know that it is hopeless. 

It may also have been a frustration resignation if he felt he made a mistake, or just wasn't playing well, or something may have come up and he needed to leave. 

I wouldn't have done...nothing too threatening from Black.

I can't see why - are you sure he/she didn't hit that button by mistake & was too embarrassed to admit it ?

Who knows ?  You got the game so don't worry about it.    

Well on the internet regardless of the site i have people resign right out of the opening with an even position only because the opening play didn't go the way they had planned ! But trying to explain  the motives of why people do certain things on the web is generally a waste of time , you could be playing an 8 yr. old and their favorite cartoon came on .