I don't know if this counts as "dumb things people have said", but I'm shocked about how many people are scared or nervous around chickens. They ask me if they are dangerous or attack people. I think they are confused about chickens being roosters. My hens are so gentle and play with the kids in the yard. They aren't scary.
I have to say that when I was a kid, my grandpa kept chickens. He had this rooster that would attack anything in the run, and I was always the one who had to collect eggs... so naturally I grew up thinking that roosters were mean and didn't want anything to do with them, I didn't really make a distinction between roosters and hens at that point either.
My sweetie talked me into getting some chickens last year and there were three cockerels in the group that we got. I totally fell in love with the roos. I love the pullets too, they are so sweet, but the roos just grabbed my heart and I have completely overcome my fear of them. I think it makes a difference to get them as chicks, at least it did for me. I raised them from day old babies and have spent lots of time getting to know them, it totally changed the way I look at chickens.