Isn't that interesting !
It is interesting (poly opinion) but I guess not surprising.
I see it as a combination of a couple things...........
I think the vast majority of the public still associate 'poly' with polygamy and all the negative associations and publicity surrounding that.
Another pretty common trait. No matter how (supposedly) open minded these people try to appear, when it comes down to it - if you are going to have yours then I better be able to have the same. If not I'm going to cry FOUL !
As part of the above mentioned ignorance - what limited knowledge many people have of poly they relate to multiple sex partners. Double foul if they can't have theirs !
It may be awhile, but I think the cat is out of the bag. I've had numerous chance encounters especially with younger (20s) folk and people a bit more 'educated/worldly' indicating that the topic is on the table for true discussion.
But the ostriches will survive for awhile yet.