So you're assuming that everyone is a sexist because they don't like Rey? Yeah. That makes perfect sense.
I wouldn't call Harry Potter, he just survived against the bad guy because of his parents. He was
Luke wasn't a Gary Stu. He lost most of his major fights and he had to rely heavily on his allies just to survive. Sure he falls into the chosen one tropes but he's fairly weak in most of the films. Rey is very much a Mary Sue. She had no training and used advanced force powers/won in light saber fight against a dark force user who was trained by Luke. People are more upset of the breaking of sw canon and characters who don't make any sense in the sw universe.
Luke was only a cliche, but no problem with that, he is a man after all.
We're not calling Luke a Gary Stu I hope. If so, I recommend a viewing of the following which illustrate/explain why Rey is a Sue and Luke is not: