Perhaps they think it's the simplest way to connect with you. You know you're convinced deep in your heart, they don't; they can't know. Perhaps this sensational approach worked with them before, and ...
I don't doubt that they (or you) have good intentions. I do think that more husn al dhan could be applied though as, sure they don't know our certainty but it doesn't come off well with it being contantly questioned. It's like the "how did you become Muslim?" question. Obviously, well intented but at the same time clearly rude.
https://muslimmatters.org/2019/11/30/convert-story-to-ask-or-not-to-ask-that-is-the-question/
https://muslimmatters.org/2019/11/30/convert-story-to-ask-or-not-to-ask-that-is-the-question/