I do not have children and I am the most unselfish person in the entire world. Just saying someone is selfish is a cop out. I chose not to have children for a number of reasons and I do not regret that decision. You think that makes me Selfish? That's insane.
I don't think you're selfish. I don't think most people would. It's this guy's attitude that those who have kids are delusional, that he thinks he's living the high life and that he thinks that others should follow his example is what rubs people the wrong way. No one was attacking you.