When I was pregnant with my first child I was working and I told my co-workers that I was going to use cloth diapers, got some of the same responses to the negative as here which after having four kids I can understand. What surprised me was I was getting the same negative comments about my desire to breastfeed my child...more along the lines of "Oh that won't last long" and "Why would you want to do that?" I've learned not to be offended by such responses, people are only speaking for personal experiences and choice and I could choose what I wanted to listen to and what I would discard.
Josie