It's been an education reading some of these but I guess mostly I'm not surprised because there is so much unawareness of so many things. But aside from a few true assholes (people who would actually make fun of anyone for how they speak - or don't, for example), I think most of the things hearies do just comes from inexperience, or simply unawareness. Most people have good intentions but are simply clueless, and there is always an endless supply of new clueless folks!
Some of what I read really has direct counterparts in the hearing world. I'm a foreigner living in Turkey; back when I was just getting my head around Turkish, people would assume I understood everything. So often, when I missed something, they'd say it again, just as fast, but as loud as possible. (Yeah, I could hear them but I may as well not have been able to.) The impatience when you don't get something, and the "oh never mind" answer sound SO familiar! And another similar one - they hear an accent and immediately start speaking what they call "Tarzanese" here. "You like live Turkey? You learn talk Turkey language good!" And it's so hard to convince them that this doesn't help!
The one that I never thought about was talking and signing (or not signing) at the same time. Since I work as a translator and spent lots of my time in translator mode, I think I'd err in the opposite direction. I've been learning TSL for just a few weeks now but already I catch my hands wanting to sign what I'm talking about when I talk to my hearing housemate.
I've just started meeting deaf people in Turkey, and as I do, I'm amazed at some of the comments I get from hearing people. Some just show they have never thought about it before ("But how will you communicate?" -Well, there is this thing called signing, people can learn it...) But the one that had me picking up my jaw up off the floor: "Well, just be careful, you know lots of disabled people's sexual orientations change."
I don't even know where to file that one!