I was also surprised by the response to what seemed like a fairly innocuous post. The only thing that I can think of is that you said "Fastest time (by GuessWho) was 27:34." I assume GuessWho is you, so then maybe your comment made it seem like your post is bragging both about the amount of climbing and about how you rode it faster than the original poster. But note that the original poster replied directly to your post and didn't seem to take offense.

Nick