I’m not exactly clear on when to resign if I blunder away my queen. If it is part of my opening, I will resign, and if I’m in the end game, I won’t. But at what point does etiquette say you should? Do opponents want to play out an uneven match? I like to play out games for practice, even if I’m hopeless, but I don’t want my opponents to feel like they are wasting their time.
I’ve always heard that until you’re master/GM level, it’s better just to play it out. Your opponent might blunder too, or accidentally stalemate you. At the very least, it’s good practice playing at a disadvantage. I know I’ve blundered huge leads myself, so who knows what’s going to happen?
There’s a psychological thing where we always assume that our opponents in games will never mess up, which makes it feel easy to give up the moment you make a mistake.