No. This whole notion is bizarre and feels out of far right wing "keep the races separate" mentality yet is employed by the far left.
Also, the internet gives everyone a voice so a handful can be focused on and magnified. I'm guessing vast majority of people are thousands of greater concerns than prom dresses.
I agree with you there, IMO a tiny minority has an actual issue with this. Unfortunately the loud voices drown them out and create a hostile environment for people like the girl in this story.