How do you tell someone you don’t want their input?
No long post about the right answer here. I’ve encountered two different answers and neither qualify as particularly nice or friendly. I don’t think it really can be done and be nice about it.
(1) Just ignore them like they aren’t there.
(2) Come up with a lame-sounding rationale, (it’s X’s house, not yours (even though you’ve lived there just as long, I guess the only way this one’s defeated is to move out and then remind them how much it hurts by telling them to butt out of your business.)