The way you ask here sounds a lot better. In the original post sincere curiosity didn't come across so much as bitterness and contempt. There is a lesson to take from this that actually goes a long way towards giving you the answer you are looking for.

A practical exercise that I (sometimes) do in such cases is to look through my words and consider why I got the response I got. I don't worry whether it was fair, legitimate or sane. Just how my presentation interacted with the audience. In this case that means identifying what could be perceived as arrogant, condescending or sarcastic.