Calling it 'borderline' is too polite. I couldn't decide if (1) he was deliberately overdoing it (revealing the satire?), (2) deeply hated children in general or (3) found his co-workers' children especially hateful or what.
Actually the whole of (7) is way over the border of anti-social:
If my work mates are talking about something other than work, I'm probably not interested. I'd rather chew razor blades than talk about traffic, weather, casino gambling, baseball, real estate taxes, gun control, politics, or Dancing with the Stars. I'd rather shoot myself than hear anything about their children.
That's pretty naked contempt.