Sorry for deviating for the topic, but I think it must be said: "Sorry for the snarky reply" is not enough, considering that you wrote it at the same time you could have gone back and rewrite the text into a polite, well-worded argument. That's just condescension - if you really were sorry, you'd have rewritten your text.

By replying like that you've ensured that your point won't come across - for all I know you might be technically right, but using that tone ensures that lots of people will refuse to read past the second paragraph.

If your argument is solid, that's all you need. IMHO, snark makes your point come across as bragging, and no one likes that.