Not many people can take criticism well and even fewer can dish it out in a productive and measured way.

It just kind of snowballs from there really.

Personally, I've always been of the mentality that if one person states I'm doing something stupid, I'll look into it and see if I can adjust to keep things smooth, but I'll not likely care enough to take it to heart. If multiple people say the same thing, then it's increasingly likely that they have a legitimate point and I need to address what it is that I'm doing wrong.