Were you winning before you mouse slipped?
Do you accept the draw?

I think it's fine to decline. Part of playing online chess is being able to manage mouse slips, imo. It would have been good sportsmanship to accept, but it would not have been bad sportsmanship to decline.

I think it's fine to decline. Part of playing online chess is being able to manage mouse slips, imo. It would have been good sportsmanship to accept, but it would not have been bad sportsmanship to decline.
well said

Your opponent had every right to decline your draw offer. Should it be "required" or "the polite thing to do" to accept a draw anytime an opponent blunders terribly and then claims "that was a mouse slip"?

It is a very irritating thing when it happens, as it has happened to me as well. However at some point it will happen to all who play chess online. Just put it behind U & move on. That is my opinion.

Your opponent had every right to decline your draw offer. Should it be "required" or "the polite thing to do" to accept a draw anytime an opponent blunders terribly and then claims "that was a mouse slip"?
Well, I said that it was a mouse slip before he captured the queen

Let me put it from a different angle: The age of gentleman-ship has sailed long ago. This is the wild-wild, wild... wild... wild... west. Even Bruce Lee knew THAT, & he was just a tough-guy imagine what a philosopher would say? Well... he was a philosopher too. (e.g. "B like WOaaTAaaa" metaphor)
...but that is not the point. Do you catch my draft... drift?

If i was in your opponents position, if it was a drawing or losing position for me, I would accept the draw bc I don't deserve the win if I win only bc of a mouseslip.

Your opponent had every right to decline your draw offer. Should it be "required" or "the polite thing to do" to accept a draw anytime an opponent blunders terribly and then claims "that was a mouse slip"?
Well, I said that it was a mouse slip before he captured the queen
Just because you told him it was a mouse slip doesn't mean they have to believe you. Many times over the years I've made a move only to realize it was a mistake the moment I put my piece on the new square.

If someone was playing slowly and made a mouse slip, I might even offer a draw. If someone is obviously playing very fast, trying to win on time, and they made a mouse slip, that's their bad luck. I wouldn't agree to a draw. That isn't the spirit of competition.
???? How in the hell could I flag him IN THE OPENING

It isn’t bad manners at all, it is totally fine to decline the draw. I give the draw, though, because once I mouse-slipped and someone offered me the draw, and I felt happy that they did that. Why not be nice, you never need a reason to be sportsmanlike. Unless you’re in a totally lost position before the mouseslip, I won’t accept as I was already winning.
Your opponent had every right to decline your draw offer. Should it be "required" or "the polite thing to do" to accept a draw anytime an opponent blunders terribly and then claims "that was a mouse slip"?
Well, I said that it was a mouse slip before he captured the queen
Though this might be true in your case, another player could have used that defence as an excuse.
I do not accept draws for such circumstances and do not offer one myself when I am the one mouse-slipping.
I probably would accept the draw, but I don't think it's bad sportsmanship to decline. It's a fight, you are there to win. If you can win by any means, as long as it's by the rules, so be it. Nothing that isn't against the rules is bad sportsmanship

If everyone was always truthful, I would usually accept a draw on a mouse slip. Sadly, everyone is not always truthful.

I recently had a game where I mouse slipped and blundered my queen, so I offered a draw and wrote in the game chat that it was a mouse slip. My opponent declined the draw so I resigned. Is that bad sportsmanship from him? Or is it considered perfectly OK to decline?
If it was considered "good sportsmanship" to resign when there is a blunder, then people would take advantage of this and claim "I blundered, and you better resign or its bad sportsmanship", even when its on purpose to force a draw.
So the answer to your question is "no, it's not bad sportsmanship to not accept a draw when an opponent makes a blundering move".
I recently had a game where I mouse slipped and blundered my queen, so I offered a draw and wrote in the game chat that it was a mouse slip. My opponent declined the draw so I resigned. Is that bad sportsmanship from him? Or is it considered perfectly OK to decline?