They love to have Bible discussions with people. But if you don't fall in line with their point of view after a few discussions, they lose patience with you.
Yes this is my experience also with those who have come to my my door. I let think they are so used to people saying "not interested" when they open the door that they are more than happy to talk to anyone and do some "preaching".
Anyhow, I lay my cards firmly on the table early on. They realise I am not going to swap my only begotten Son of God mediator for their WT and they get fed up with me.
All the best,