Totally agree. I was considering myself to write a message like this since so much time.

The people I know and recently myself are keeping this kind of people on our Friend List instead of kick it just because it's easier to skip them seeing the orange name.
Honestly, I love this game but this is the biggest problem it has, because all games have a REAL block option which means disappear from their Friend Lists, don't see your character and don't put in a party with you.

I had once some harassers in the same party for two consecutive raids...

I'm not someone who has lots of enemies, but you know how some people is, taking IRL problems to the game and trying to bother, so please, consider it because so much people aren't feeling confortable and maybe they're really exposed in the game to IRL harassers and can't feel safe playing the game...

To be honest, your Blacklist button just works if you are in the same Linkshell or party that someone you don't want to read, but this person can come to your position or bother you anyway...

We hope you seriously consider to add a real Block option to make players feel safe and confortable; we trust you.