If someone repeatedly said things in person like "Give me a fucking break" and "fuck off" and being generally disrespectful, while asserting that "I've already torn apart every single point you think you've made" and regularly misreading what's being said and failing to address the substantial point then yes, I would call them immature.
People on HN generally start off with a reasonable amount of respect from me - more so than Reddit or 4chan for instance. I've never seen anyone piss it away so rapidly before though.
Not to mention, there were a lot of arguments he made about not being concerned about being offended, then he got offended and started getting abusive. Ironic.
