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Because it has been downvoted to oblivion. HN is a "community" and there are unwritten rules that apply. Being deliberately impolite, attacking another users grammar and not views (especially when the topic is not related to the English language) can have that effect.

Generally speaking, HN promotes constructive criticism and bashes trolling in direct or indirect ways.

The comment was down voted to the point that it is not 'visible' (you can highlight the text to read it). For more info check out:

http://jacquesmattheij.com/The+Unofficial+HN+FAQ#downvoted

The FAQ there may be useful for you as a new user in general. :) Enjoy HN

Grammar Nazis are not really that interesting.