The other day I was playing a rapid game (30 minutes each side) online. I got into time trouble but I managed to convert the position into a drawn endgame. (Not just a theoretical draw—a clear draw for both sides.) In the final moments of the game, I had less than 20 seconds on my clock, and my opponent started checking me repeatedly in an attempt to make me lose on time. While I know this is standard in blitz or bullet games, I considered it to be bad form given that we were playing a slower time control. Am I right in believing this is a breach of etiquette, even if it is strictly legal?
Edit #1: Here is the final position. (I slightly misremembered what my opponent did—they weren't repeatedly checking me. Instead, they were moving their bishop around aimlessly. However, I don't think this has a huge impact on the debate. I was playing White.)
2b5/1kP1K3/8/8/8/8/8/8 w - - 16 86
Edit #2: It has been mentioned that there is another similar question that has already been asked before on the chess stack exchange. While I appreciate the similarity between these two questions, I would argue that the fact that I was playing a rapid game could have an impact on the answer. Not everyone agrees, but some people do hold this belief. Therefore, I'd like to keep this question open.