Don't think i've used it on here 'mental ignore' works well. I have blocked people on FB, because particularly during election years there are those that get quite persistently unpleasant. Tho in recent years i've considered blocking the guys who pop up on my posts with smarmy flattery requesting i friend them, despite a warning pinned to top of my page that i will not respond to such posts.
The problem is they are clearly looking for a relationship (even if a Catfish/Mark one) and i'm NOT! Friendship yes, but those develop naturally if someone responds to posts with a relevant comment or humorous observation. Some of my male FB friends i knew from now defunct Eons. Some i met on threads created by other cyber friends because, just imagine, we actually had an interesting and/or fun exchange of ideas. You know an actual conversation?