“Vile. [An] insult to all real women who have had a mastectomy owing to breast cancer.”

How is this an insult at all? Are people who get cosmetic plastic surgery insulting people who get reconstructive plastic surgery after an accident?

These are not serious people and there's no point in engaging with them. No matter how you do it, they'll find some ridiculous reason to claim that representation is "insulting" or otherwise inappropriate.

I’d hardly call one Xitter reply from a bitter transphobe “backlash”.