I think that unless there's a rule about needing to adhere to canon character design in terms of gender, race, and sexuality (note: an actual, existing policy requesting this would go over about as well as a lead balloon), that an honest attempt to do something artistic with the character should be treated by the player base with the same respect that they expect in return.
IMO, the best way to handle this is as such:
A lot of Marvel complaints about the influx of characters having major role rewrites based on sexuality, political stance, racial or gender demographic, is the complaint that the existing character didn't need to be changed, and that they could have just introduced a new character. It makes it very difficult for a game full of FCs to understand what IS or ISNT canon if the Captain America has a wildly different backstory (Does this mean that Secret Wars never happened?!?!)
Now, those of us who pay attention and are smart know the reality, which is that Female Thor isn't a rewrite of Thor Odinson, but Jane Foster wielding the hammer. That Riri Williams isn't "Black/Female Tony Stark", but a new character taking on an Iron Man mantle.
It's a shame that a certain amount of people are culturally okay with one-way reimagining of characters when it suits their social preferences of race/gender/sexuality, but aren't comfortable having existing characters with those preferential demographics being altered.
Sucks, but I think the effort to being universal, fair, and open minded on this topic is an obstacle course lined with Hog Pit posts.