Bitch CAN be derogatory. But your whole point is that I have no right saying using the R word is wrong because of my username. In the context of my username, the word bitch is embraced. Words with derogatory meaning have from time to time again been embraced by the groups the words were meant to oppress (i.e. the N Word, Queer being embraced by the LGBT community, bitch), but the R word is not among them.
Glad you agree with me on that point, but I don't think my username should discredit my opinions on the matter.