Nothing, really. Arguments like "you're bashing it for the sake of bashing it" are built upon nothing but the inability to properly express your opinion. Therefore, it's easier to dismiss an opposite view by saying, "oh, you're just saying that because everybody else does," "oh, you're just a TNA fanboy," or "oh, you're just a WWE fanboy."
When people bash TNA, it's not to be cool. It's because TNA is fucking awful television. When people bash HHH, it's not to be cool. It's because he has never been an entertaining face, and hasn't been a good main event feel for more than maybe two combined years of his career. When people bash Cena, it's not to be cool. It's because they personally are bored of him (and because they don't understand pro wrestling
).