Konan was a member of the Akatsuki - a group where you didn't get in if you were weak. She hold her own pretty good against Obito. Tsunade is a Hokage and known as the best medic nin. Mei is a Kage as well.
Kushina was able to survive the extraction of the Kyuubi and even helped Naruto tame him later on.
Hinata and Temari are women who aren't weak either and can fight very well.
Did you confuse Rin with Sakura? Because from what I have read, Rin was actually nice to Obito and even befriended him. It wasn't her fault that he didn't have the guts to admit he had a crush on her. Don't blame Rin for something Obito didn't have the guts to admit. Obito chose the path he made for himself - it's not Rin's fault.
Kishimoto-sensei isn't sexistic. He admitted during an interview that he is bad at portraying women in the manga, but even with that I think he did a fairly good job still. At least his female characters have bodies that can actually be found in real life as well - he has both curvy women (like Mei, Tsunade and Hinata) as regular sized girls (like Sakura, Tenten, Kushina ...).
I consider the mangaka of High school of the dead more sexistic - while the girls in his manga can fight off zombies well, their bodies are way out of proportion (big breasts, very thin waist, very slender, long legs ...) and contrarily to the guys, they don't seem able to keep their clothes on during the fighting. I've only read the first two, three volumes so far, and practically all the main female characters have already lost their clothes, leaving them in nothing more than skimpy underwear and in one case even with just panties and a kitchen short, before they all went in bath together. And the guys? Well, they managed to keep their clothes on strangely enough.
Also you have to keep into consideration the Japanese culture. You can't put the Western view on some things together with the Japanese view. The Japanese people have viewed women as caring mothers who stay home and do the household and raise the children. Of course nowadays most women do have a job as well, but most women don't mind to stay at home to take care of the children and the household.
Naruto is a shinobi world - a world filled with fighting. Is it a miracle that most female characters are put into a healing role then? And even then they still are able to fight. Some even combine fighting with healing (like Sakura).
So yeah, sorry, but I don't view Kishimoto-sensei as sexistic. Sure, he could do a bit more work regarding the female characters, but overall he did a pretty good job in my opinion.