Nnoitra is not sexist

No he doesnt hate women. Him saying that he hates women with power is but an attempt to taunt Nelliel into fighting him. It was evident from context that he respected her as an opponent. He did many things trying to get Nelliel to fight him, for example killing other hollows infront of her. What he wanted was a fair fight and his main motive was to die in combat.

He could have killed her when she devolved to a child, but he chose not to and gave her a chance to regain her powers and once again fight him. The same kinda thing was when Chad was about to deal his final blow with all his reiatsu (which Nnoitra could have easily dodged, but stood still), and Nnoitra got mad at Tesla for blocking this attack.

It would be more accurate to say that he hates everybody equally if anything

No he doesnt hate women. Him saying that he hates women with power is but an attempt to taunt Nelliel into fighting him. It was evident from context that he respected her as an opponent. He did many things trying to get Nelliel to fight him, for example killing other hollows infront of her. What he wanted was a fair fight and his main motive was to die in combat.

He could have killed her when she devolved to a child, but he chose not to and gave her a chance to regain her powers and once again fight him. The same kinda thing was when Chad was about to deal his final blow with all his reiatsu (which Nnoitra could have easily dodged, but stood still), and Nnoitra got mad at Tesla for blocking this attack.

It would be more accurate to say that he hates everybody equally if anything