If you click on the profile icon of a user, on the lower right of the page there is a link "add to your ignore list". I've never tried it, but it might do what you want, at least for PMs.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus