Pretty dumb reason to stop liking her. Your real beef is obviously with the people who obsess over her tits.

And they are pretty big, actually. I mean it's not like you go outside and all the women are sporting Tifa-chests. It's not just Tifa, though; prettymuch all of Nomura's character designs for FFVII are rather grotesquely misproportioned. Just look at Bullet.