Marak, the guy behind the Nodejitsu (and, presumably, the popup message) is known to exhibit asshole behaviour. (See: http://news.ycombinator.com/item?id=1448309) The popup message is consistent with what HN knows of him.
Whether being a jerk justifies banning I can't say - but his assertion that HN is biased has little justification (particularly when you consider that the writer himself is biased.) Kindly ignore.
Whether being a jerk justifies banning I can't say - but his assertion that HN is biased has little justification (particularly when you consider that the writer himself is biased.) Kindly ignore.