At some point, you'll probably read this from one of the anti SasuSaku:
"Sakura is not an Uchiha. To be an Uchiha, one must master the fireball technique, and since Sakura can't do that, she is not considered as an Uchiha."
We are introduced to this type of "rule" in the Uchiha when Fugaku was teaching Sasuke the fireball technique:
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Because of this, the anti keeps saying that Sakura isn't an Uchiha because she can't do it.... as if what Fugaku said applies to her. Look - this type of thing is an Uchiha thing. It is only applied to the people who are born from the Uchiha Clan.
Sakura isn't an Uchiha - though she may not be an Uchiha by blood, she is an Uchiha by family. It's such a simple concept that they don't want to accept.
