I’m sorry but in my opinion if they ignore signs on the door telling them that you’re not interested, then they are being rude, I once had two knock at my door they started with their religious nonsense, and I told them that I didn’t want to be rude but I wasn’t interested and would they please leave, well they kept talking, so I then said well I gave you fair warning that I didn’t want to be rude, but now I will be if you don’t leave immediately.... they took the hint.
To try to keep persuading someone even though they have said that they don’t want to know is extremely bad manners, and I have had this on a number of occasions, they don’t just leave politely when you say to, so now I just don’t answer the door, I don’t hide , I think it’s fine for them to know that I know that they are there and that I’m just not answering.