Is winning on time bad manners?

I should had added if your opponent had a brilliancy like mating attack you should not resign. In that case you should witness and clap on his brilliant play.  Just don't consider fighting till you or  your opponent time run out if you are down by four piece and your opponent have no immediate plan in his play.  I say respect his creative mind but don't try to flag your opponent if neither of you got nothing and you are down by four piece. 

If the position is equal and both players are down in time then the only strategy is to flag your opponent and this strategy have world wide acceptance and approval. 

Not at all. In fact, one can justifiably argue that had your opponent moved quicker (and had you taken more time over your moves) you would have been in a better position. 

I played this game yesterday. It was 3/2 time settings so quite quick. I played some lazy moves. 

19. Nd5 loses a pawn. 

22. Rd1 loses another pawn.

By move 48 I am in an inferior position. A pawn down. But I have 1:44 left on my clock. My opponent has only 0:27 (27 secs) left. 

By move 60 I have 1:43 left and my opponent only has 12 seconds. The position is drawish. If anything black can win. But it is unlikely white can win - if we have loads of time. But we don't have loads of time. I do. My opponent doesn't. Eventually his clock runs out and I win. It's a totally great win of which I am proud. The only reasons my opponent got a better position is I played quickly. It's a trade off called time management. And it's part of the game. If you don't want the clock to be part of the game don't play blitz. The blitz game I played yesterday was the second I played that day but apart from these two games I have not played blitz at all - or any timed game for that matter - for at least 3 years!! I generally don't like it. I was just a bit bored yesterday. I play daily chess ( used to be called correspondence) where the clock is pretty irrelevant (you get one day or three days to make each move). I have played nearly 7000 daily games over about 10 years.

No. The opponent might not be four pieces ahead had he moved quicker. 

Imagine two players play a game of blitz chess (3 mins each). At move 30 player A is two pieces up but with one second on the clock. Player B has 2 mins on the clock. Who has played best? In my opinion player B has played best. If you say player A then you may as well say that we are ignoring the clock. In which case, why not play without any time limit if that's what you want to do. 

In blitz there is no point being creative and having all these great moves if you used up all the time on your clock. That's simply dumb play.

I should had error checked my today's post. I have successfully edited the mistake. Hopefully my post didn't cause much confusion. 

And to you. Yes,  my original post in the first page created a lot of misconfusion. And it created a lot of fear in me.  i fear that my opponent would stall the game in the midst of my brilliant attacking game. And to tell the truth,  it affected my game. That's why i today made an improved version of my original post. 

I think it's fine to win on time. It's like saying in a dodgeball game, you cross the line even though you have all of the balls on your side, and you blame your opponent. The clock is part of the game. You cannot deny it, and it's your opponent's fault for losing time. For everyone who says resign, I once won a game even though my opponent was up a queen and a rook, a bishop, and 4 pawns. Who says backrank isn't handy? Anyways, the clock is part of the game. If you want to be like that, play 1 hour chess.

Dang I thought I got grumpy when I get flagged lol.

Although I'm 56 years old, the only appropriate response to the above is "OK, Boomer."

No its not. Its blitz and will never be "real chess". One can always play longer games or with increments to prevent those situations.

To keep playing a "lost" game based on the opponent's clock is not nice but is not bad manners per se. It goes into how difficult is to convert the advantage in the remaining time. At any rate, there's no rule forcing anyone to resign no matter what's happening on the board.

No.

Grow up! You have to manage your time better and stop whining! Mic drop.

So true! These :whiners" should grow up and stop complaining. Mic drop.