what gkp seems to be objecting to is the "marking by contrast" of the unmarked status of the normatively privileged group "straight white male".

the argument seems to go:
1) marking disprivileged groups sets apart any group not marked as such
2) why are you picking on straight white males?
3) why are straight white males subject to so much criticism?
4) this criticism constitutes disprivilege also.

understanding why 2 is a wrong question requires a long discussion of privilege.