Time management is part of the game.
this player has no manner
So you won a queen AND a piece, but couldn't manage to win the game? And you blame your opponent? And then you accuse your opponent of having no manners?
28. Qxg6++ wouldn't have left much room for blame anywhere.
He's rated 1640 and missed that?! 
Could have been running out of time. Need to know the length of the game.
I assume this was a 1 minute game..
Otherwise it beats me how a 2000 rated player could walk into that mate in the first place!
After losing a queen, he kept playing until won on time. Then after I posted a note on his wall saying dont play for time, he deleted and blocked me, only keeping compliments on his wall, what a fake player ! I don't really mad about the game it's just a game so losing is normal but I mad about how he deleted and blocked me on his wall after a polite note.
What he did was perfectly legit. Period.
No one complained about the famous match against Ivanchuk vs. Anand where Ivanchuk missed MATE IN ONE and Anand kept playing shuffling around without doing anything and managed to win on time.
It's part of the game. End of story. You, on the other hand sound like a butthurt kid pointing a finger to someone and calling them fake players saying they have no manners after they beat you.
He was the better side, he avoided losing. It's part of the game. If you can't break through his defense however weak it looks to you, he is better than you.
Grow up and grow some.
what was the time control? I mean how many minutes each?
1 minute.
Is that so? Then why is he complaining about this? This is basically what happens every second game in bullet.
that would also explain some of the overlooked tactics and the overlooked mate in one(move 28)
1 minute games is who can move the mouse fastest. I guess.
A lesson for you in manners.
When your opponent outplays you and wins, you offer them your congratulations.
No charge.
I would also play on if I play against an opponent that does overlook mate - no disrespect intended but if my opponent does not make the best moves I can survive.
I lost many games like this.Had material advantages more than a queen but have no time to checkmate !!! Is it a blitz ? or bullet? If you want to avoid this ,you should play standard or online game .
ok maybe I'm the one with bad manners, I totally lost so thank you for your comments, It helps me a lot.