Oriental is not an offensive term according to the unanimous opinion of over a dozen Asian friends I've broached the subject with, but that opinion isn't aligned with San Fransisco leftist political beliefs so I was banned from HN. Liberals are open to everyone as long as you think exactly like they do, otherwise fascist-style political censorship and hate is the rule.
Had you stopped at "Oriental is not an offensive word", individuals may have downvoted you to express their disagreement, but I doubt you would have been banned. Personally, I think 'Oriental' sounds a bit dated, but not of itself offensive.
Instead, you were banned because you followed it with "anyone who thinks it is should grow a pair and get a life. The hypersensitive PC social justice crap is so wearisome." It's the insult in this second part that went over the line.