The ignore thing works.

Click on the persons name.

Then click on
"Ignore This User"

You will not see even any more of that persons posts at all.

If you should want to see what that drip is posting
click on the top of any board "Settings"
just go to "My Ignores" on your profile.

You will be able to click on & read their posts (all)

I love that feature.
I have 7 screwballs on ignore.
My inbox is very much fresher.