Who said anything about higher or lower taxes? You said, "nothing." Not all conservatives think that the middle class pays nothing in taxes. In fact, I'd say that most of them probably don't. Implying that all conservatives do think this way and following it up by railing against that statement is, indeed, setting up a straw man.
There's room for a legitimate argument to be made here. Don't waste your time on silly things like "according to conservatives, they pay nothing."
So an obscure political forum, that approximately 20 people frequent (that's generous), on a board dedicated largely to discussion of the Buffalo Bills is representative of all conservatives? Interesting.
Because that's ignorance, not a fallacy. I don't care nearly enough to illuminate ignorance in someone's life. That's why I think DC Tom is such a nice guy. He cares so much.