I stop by the DVC Kiosks all the time and I never had a problem with them, I
would tell them I am a happy member and if they continue with a sales pitch
I tell them they are very good at their job and wish them luck. But I would never contradict each of their sales pitches with a negative reply. I always tell people to treat people the same you want to be treated.
I do not agree with the salesperson's final reply especially if it was not done in good humor.
But, to the OP you need to have thicker skin. You can not let something like this bother you for over a month.
People give out too much information when dealing with others, whether its a DVC kiosk rep or your mother in law, and then wonder why they end up in arguments. A sales rep isn't entitled to more information than "Sorry, not interested." When you start giving reasons for not being interested, you open yourself up to arguments about those reasons.