I just stated that I had some different views than what the religion teaches but that I still had respect for their beliefs.
There's nothing wrong with your total politeness method of talking to them. But I could not say I had respect for their beliefs. Their beliefs cause so much pain and rob people of proper life planning. I RESPECT PEOPLE's RIGHT TO BELIEVE SUCH NONSENSE, not the beliefs themselves.
Otherwise, that was wonderful. You showed them that people can have differences and be pleasant and normal. Keep in mind that most former JW's that become "unpleasant" only do so because of the type of response they get when trying to point out their problem with the doctrines or practices. For instance- if I said "Can you explain this 'overlapping generation thing'?" in a pleasant tone, I might receive the evil eye and a cold response like "So you are an apostate!"