Wrong is wrong and right is right. You can't say that since he occasionally does some 'no sexist' things doesn't take away his sexism. Orochi is not even a fighter like Doflamingo and even then Denjiro has to finish the job for Hiyori? I thought she is resolute. What happened to Komurasaki that bitch slapped Orochi in act 1?
You'll probably try to turn this around to your point since your example actually failed, but seeing how she ventured to Onigashima alone and managed to reach Orochi somehow undetected, while stopping to tend to the Scabbards, and had Orochi on the verge of death until the nail fell out, she's actually been improved.
Oda tried to use his narrative to address what you're talking about with Tashigi's character and her supposed rivalry with Zoro and look how that turned out lol