not resigning is not rude. asking someone to resign is.
the other way around bruv.
"hey man please resign bro just resign" have you tried playing better moves that win faster instead?
Sometimes when I am completely winning and they have no counterplay I ask them nicely and it saves me a few minutes rather than playing on
well you're 15 so that's your excuse
Its rude to stall, and also against the rules of this site.
Personally I find it much more satisfying winning by checkmate than resignation and when I encounter those never resign people I make sure to take all pieces and make as many queens as possible before ending the game.