The commenter was likely getting downvotes because they were trolling. Now, in true Slashdot fashion, they received upvotes from someone saying, "why're they getting downvotes, durr?"
You are likely getting downvotes for spitting the vitriol the troll feeds on. You may have even helped them climax.
If I had anymore mod points I'd downvote both of you for those reasons. Instead I'll just leave this here and hope others agree.