I liken that type to "slime under the door" meaning given the slightest opportunity they will slime their way into your life, and it'll take a lot of effort to get them out again.
I have a relative who is trying that right now. I'm not going to even acknowledge their condolence. I have enough on my plate. Don't need this too. Good for you. Grey rock rocks!
M 20+ T25+ S ~15.5 (BD) BD 4/6/15 D 12/23/16
"Someone I loved once gave me A box full of darkness. It took me years to understand, That this too, was a gift." ~ Mary Oliver