He sounds insufferable because he's calling syntax highlighting childish. Not simply politely saying it's not his thing. It's like he can't understand why any

He sounds insufferable because he's calling syntax highlighting childish. Not simply politely saying it's not his thing. It's like he can't understand why anyone else would use it, or isn't bothering to. Maybe there's more nuance to what he said, but it's not obvious from the quote.