Quitting at the end of a Game..

You mean when the player resigns? That's them saying that they know you won, and they're not wasting your/their time by playing it out to the actual checkmate. That's not a quit. That's "the game is over. you won". It's not a free win. (Assuming that you're actually going to checkmate them in a few moves and there's nothing they can do to stop it.)
I get more annoyed when people randomly resign in the beginning/middle of the game because they lost some material but there's still a whole game left to play. We're on the level that there'll still be more blunders to come. That is getting a "free win" which annoys me. I want to play.
But if there's nothing to stop an oncoming checkmate, or the players know the game well enough that the player in the weaker position knows he'll eventually lose, resigning is just the respectful thing to do. Although to be fair, I'm very new, and I do enjoy doing the actual checkmate. But I'm at a very low level. I just started.

Of course I mean when a player resigns. And yes I used the term quit. To me, when someone does this with one or 2 moves to checkmate, it's a rage quit, not a friendly resign. Playing out the actual checkmate would take like 2 seconds. Now if you are half way through the game and you just lost your queen, maybe are down 5 points or more, then sure resign is probably the way to go. As for "enjoy the free win" that's what one guy said to me when he realized there was 2 moves until checkmate. It bothered the hell out of me ;) and I've seen that happen a good bit.
Then that guy was a sore loser 🤷♀️ You won. He knew it. You knew it. If I was sure I was a few moves from checkmate, I assume I'd resign as well. The game is over. My opponent won. Why would we both keep moving pieces for no reason? I'm fairly new, but from the few videos I've watched of tournaments, one player resigns when they know they've lost. I haven't seen any higher level players literally play out until they actually complete the checkmate. The resign isn't a quit.
Okay, yeah, that might be where the misunderstanding is coming from. Resigning is accepting defeat. Saying, yes, I lost. You won. The game is over. (In a tournament, you would just say you resign, shake the opponent's hand and game over. They won.) Assuming they're both on high enough levels, that the losing position knows they cannot win (unless the opponent makes a blunder, which they shouldn't), so the game ends with a resignation.
That's why it pisses me off when I play (low level) with other low level and they'll just resign mid-game cuz they hung a piece. There's still a whole game to play and just resigning halfway in this case, is really just quitting because they can't get an easy win, so they quit, instead of actually playing. There's no telling whether I would have or would not have won the game, but they see it's not easy so they quit. Beginners definitely shouldn't resign mid-game because their opponents might still not be able to win even with a current advantage. But at the end, with a clearly losing position they can't see a way out of, them resigning is accepting the loss. It's not a quit.

On these forums people usually complain about their opponents not resigning when they "should." But everyone so often the reverse pops up.
Given how many people are on this site, and their enormous range of background and experiences, being upset when someone has a different idea of you about when to play on and when to not play on seems a tad silly.
"To me, when someone does this with one or 2 moves to checkmate, it's a rage quit, not a friendly resign."
That's because you are wrong

K. Cool, I'm wrong, I'm the A hole for wanting to play out my win. Thanks for pointing it out. Peace.
K. Cool, I'm wrong, I'm the A hole for wanting to play out my win. Thanks for pointing it out. Peace.
You're not an A hole. Just a misunderstanding of what resigning means, which is totally fine. I didn't even know this stuff until a little while ago. You're good. Next time someone resigns a few moves before checkmate, pat yourself on the back because they realized you won. The game is over. Congrats!