Since there's been quite a few requests for something like this, I decided to make one.
It's really simple and straightforward, so it doesn't need much explanation. It's also not case-sensitive.
/ignore username
/unignore username

Please warn me of any bugs or features you'd like added.

There is bug though... You can get whispered by them lol

There isn't really nothing I can do about that, but you can use /hush to disable whispers.

Are there any ways to disable it on other players?
Like force them to listen to your genious phrases and words?

What would be the point in that?

Satisfaction from seeing others being tormented by your words.

You're pretty much asking for a polar opposite.

It would be highly appreciated among others like me.

It won't happen.

Why make a script to ignore someone and then make a script to un-ignore? It would be pointless to make the first script, then.