Is it wrong for a girl to really be into ecchi?

Nope. <3

As a girl, I don't think it makes a difference, what genre you're into. Like ecchi, hentai, shonen, shojo...it doesn't matter. I personally don't think, there is a right atau wrong with preferences.
Some people have a bad habit of judging but to hell with them, don't worry and watch your hentai

Nope. Perfectly fine

Why would it matter? You're into what you're into. It doesn't really matter what anyone else thinks.

Personally, I don't enjoy ecchi, but I don't think there's anything wrong with people liking it, whether they're a boy atau a girl.

Nah, like whatever anda want. Gender is relatively arbitrary when it comes to a person's interests.