Is it bad sportsmanship to refuse to resign when you are in a severely losing position?

Especially if your opponent outplays you in the opening or middle game, and you're at a huge disadvantage (like a full queen or worse). I've been running into a lot of people who refuse to resign, then try to find the sharpest possible moves to goad me into making a silly mistake.

I can, of course, just be very careful in those situations and win 99% of the time, it's just bad manners for someone to force the issue like that. I think it's a complete waste of time solely for the purpose of trying to tilt someone or maliciously 'trick' them.

I can't decide whether that behavior deserves a 'thumbs down' or not at the end of the game.

As a competitive person (not to say I'm good enough to play competitively, but in general) I tend to fight to the end. I resign when I have no fighting chance (I won't make you chase a king for 10 turns just because).

But, I feel chess is more of a "gentleman's game" (or gentlelady), and in that regard, I think it would be considered better mannered to resign in these situations.

In the end, I don't have a problem with the game going to the end, if I mess up, that's on me, and if I catch my opponent in a blunder end-game, I'll take the chance for a come-back win.

I feel similarly in bullet chess (1|0). I'll be winning or very near to mate, and the other person will just make random moves to time me out. 

It's frustrating, but I don't fault the player either. They want to win as bad as I do. They just found an annoying way to do it ll

You pull your Jedi mind tricks on them yet you deny others the chance to maliciously trick you....come on now, fair is fair.

As long as you're not stalling there is nothing wrong with playing until the bitter end. 

I might resign if i see that there is nothing i can do to win the game. Let's say that you are white, and you only have your knight, bishop, rook, and a couple of pawns, and of course king, while your opponent(black) has queen, king, both rooks, a knight, both bishops and a couple of pawns as well, then I would play then if my opponent keeps attacking my king with his king then I would resign. The match would be 6 vs 9.

generally... yes (to the title question)

no