That would actually only be true if everybody (in any sort of movement, or under any sort of label) always adhered to the common beliefs and practices of said movements or those of the majority. Somebody who is pro-feminism should be very concerned with calling out those they perceive as bad apples or giving a bad reputation to the label or ideals. (I guess very much like how some people are calling out this particular comic cover because they view it as bad or damaging or to not fit with the current ideals or representation.)