Mischaracterizing an opposing position is not an argument. It is a misstatement. It's actually kind of offensive. I rarely point out logical fallacies by name, but that particular one is an exception. There is no basis for discussion when the parties cannot agree on what is being argued by each.
I should also point out that there are broadly two categories of straw man. One born of confusion, i.e. unintentional, and the other dishonest. If someone mis-describes my argument, I first check to see if I made proper sense, and if I didn't, I restate and clarify. Most of the time, however, the argument was perfectly clear.