"I think she's attractive" or "I don't personally think she's attractive" = okay "She looks like a fat cow" = not okay

I don't personally believe this is gender-specific, or subscribe to the idea that women are allowed to thirst over women publicly and men aren't, but we ought to all be on the same page that it's not okay to compare a woman to a cow, and so therefore no hypocrisy occurred. Just consider time and place, and be respectful, and it's fine.