Here is a somewhat unorthodox strategy which may encourage
unwelcome, pushy house visitors to leave.
Tell them,"sure..have a seat, you don't mind if I work while you talk?"
At this point, you start fiddling with your firearms collection spread
out on the table..."cleaning" your pistol, shotgun, assault rifle,
whatever you might have. Let them see you lovingly buff your
Colt or Remington or Ruger or whatever, drop a bit of oil here and there.
Shine the stock.
Particularly intimidating might be loading
and unloading an ammo clip..especially one of those 30 round
M-16 clips. Click it in an out of place in the piece a few times
(don't actually chamber a round though, and make sure there's
none previously chambered...don't want any accidents!).
Be sure to give them an occasional "uh-huh" while doing your
firearms "maintanence" as they prattle away.
You may be amazed at how distracting your little show will
be to their "TR" discipline, to their intended spiel. Bullbaiting
as an art form! They might become somewhat uncomfortable
and leave. You are obviously dangerous and unpredictable...
certainly not "their" sort of fellow!