When I was 16 or so, going door to door, I used the traditional
"Good morning sir, I'm taking advantage of this sunny day to talk with my neighbours today about..."
At which point he stopped me and said:
"No! You're not here to talk, you're here to preach. Let's be honest here, you expect to teach me things and you don't really expect to learn anything from me."
Though I got around his argument in an instant, his words never left my mind: he was right, I had no respect for what people believed, the why, and the how it compared to my own beliefs. From that day on, I started to be open minded. Through the years, the gap between what the organization thought and what I believed grew slowly but surely. 20 years later, I left with my wife and kids.
I can sincerely tell you that what this man told me that morning in field service had everything to do with it.
So what you did just there, even if they dismiss it, it will slowly make its way to their heart until one day, they will act on it.