Dualism is based on nothing, true, but the same can be said for materialism and idealism. You've stepped outside science and into metaphysics, in just the way I described.
Now, it is possible to reason about metaphysics, but trying to argue from science ("based on nothing"), ad-hominem attacks ("don't know shit about "mind" beyond their baseless dogma and refuse to learn about brains") and handwaving ("woo") doesn't make for a coherent case.
Try reading "Aping Humanity" by Raymond Tallis -- prominent atheist, neuroscientist and philosopher -- and you might learn that things are more complex than you think. Assuming you're willing to move beyond baseless dogma, that is.