Chill out. He didn't try to insult you, he said it's somewhere else for those things to go. He didn't claim it's actually unimportant, and frankly, Hacker News wasn't intended for this kind of discussion - the guidelines support him.

Whether or not that means it shouldn't be here at all is up for debate, but don't act as though he's being insulting when he's just supporting something that's reasonable. He can voice his reasons just as you can voice yours. You're the one being more insulting.