Yes, I've noticed. I'm guessing there may be many reasons, ranging from:
- attempting to make you feel that your opinion may be incorrect since you are outnumbered (as if we're not painfully aware of that already)
- attempting to ease their embarrassment for trying to pitch some of the things they come up with.
(It seems to me that you'd have to spend a lot of time with others who have the same delusion in order to keep your delusion from losing out to Reason.)