I'm just playing through the games from England v Azerbaijan from the Olympiad and i see that Gawain Jones lost a BNK v K ending to Mamedov (who i believe is 2700 or near enough).
My question, could this be considered rude? Surely it should be pretty obvious that such a strong player will know this ending (and know a lot harder endings besides). Should Gawain have just resigned? Giving a 2700 player 50 whole moves to find the mate in this ending, I'd say he has a better chance of winning the lottery than somehow making the 50 move rule.
I was looking at that game as well. I wouldn't say it's rude - they are playing for the team, and if there is a chance of a 1/2 point it should be taken. Very accurate play from black in the endgame as well. Yes they are GMs and we should expect that, but still, we can marvel at it ..