There is no reason why such a technique shouldn't be used in comics. As a literary technique (yes it shows up in novels as well), there is nothing wrong with it. In fact i'd say it used less often in comics then almost any other narrative medium.
Never mistake absense for exclusion. Right now the house i'm living in has no men, no people of ethnic minorities, & no one with a major physical disability, but that not to say that the real estate company is excluding them, or that the real estate company needs to go out & seek them: Absense is NOT exclusion. Unfortuantely you've fallen foul of a concept called "equality of outcome" which is not equality at all. Business cannot function under equality of outcome & as such functions under equality of oppurtunity (which is equality, unlike its outcome based partner).
In fact, if DC were to have an open writing space for example & they went out & only sought out female writers, that would be sexism. Openly sexism in fact, as it would literally be a choice made specifically by gender (the dictionary definition of sexism).
There's nothing wrong with that statement (especially given that its 100% true & demonstrable); its just where peoples interests are, as we are not all the same person.