-They hate Sakura simple as that. They have always seen her as the big stepping stone preventing NH from becoming canon.
-They cling to the past keep bashing her for the way she treated Naruto back at part 1.
-They just see her as a she-demon manipulative, lying b**** that doesn't deserve Naruto.
-They bash her because she used to chase Sasuke in part 1 and now she loves Naruto they don't want to admit that. It's better to think that Naruto is her silver medal for not winning Sasuke.
-They prefer Hinata in a heartbeat over her because she's the right person for Naruto. She will never hit him, hurt him, lie to him etc etc.
-They just want her out of the way so that Naruto goes to Hinata.
With all these reasons is very easy for them to say that Sakura was lying to Naruto in her confession and to think no one from Sai, Kakashi and Yamato said that she was actually lying to him. It was only Naruto who assumed she was lying to herself because of his wall of denial that she will always love Sasuke no matter what. Yet the only thing that Sai made it clear that she wasn't lying about loving him" she thought she lessen your burden by confessing to you."
And yet Sakura knew she wasn't going to get through to him about stop chasing Sasuke because she knows him very well, it was confirmed by Yamato. She confessed to Naruto as a" last will" act knowing she was going to kill Sasuke and die in the process. It will be better to tell Naruto how she really feels knowing she might die and that he might hate her for taking the decision to kill Sasuke by her own hand. She thought killing Sasuke might erase the burden Naruto chose to carry because of the POTLT.
Great Great point, your view makes a lot of sense. I hope one day Kishi makes it very clear to all readers that Sakura will never lie to Naruto about loving him since Naruto makes it very clear that a joke like that will not be funny plus she knows how much he loves her.
I'm a die hard believer that she was not lying about loving him.