For what it's worth, I agree that that comment is not worth -8 karma and have upvoted you accordingly. I probably would have done that for any karma level below -1. But some of the backlash may have been to a couple of things: 1. I do think you were wrong (I agree with wedrifid's comment) and 2. You made a comment mentioning how much you were being downvoted and were rather stubborn and argumentative about it. This (my post) is quite literally the first thread, comment, etc. that I've seen someone make about how much they've been downvoted that actually lead to upvotes.

Edit: Fixed hyperlink to wedrifid's comment.