The way all disabled people are treated is appalling and its not always in direct ways either. I often take my dad out, he's in a wheelchair and the amount of times people address questions at me that are actually for him is ridiculous.
In a shop where DF is the one physically handing over the purchases and presenting his card, cashier looks at me and says: "would he like a receipt?" (I don't know, ask him).
In a cafe where DF is holding the menu, waiter says to me: "And what would he like?" even when DF gave the order himself the waiter then says to me "and would he like tea or coffee?" (I dont know, ask him).
In the garden centre where DF has asked where a certain plant is, the assistant asks me: "which variety is it you're after?" (I don't know, ask him) and then when we sort that out he tells me "just leave him parked there next to the stock cage and I'll take you to that section" (is he the human equivalent of a stock cage now!?)
In the coffee shop getting takeaway drinks, DF has place the order: "does he want a lid?" (I don't know, ask him).
And don't get me started on the people who will cut around his wheelchair or even wheel him out of their way if they need to be in at where he is, apparently wheels mean you can't understand the phrase "excuse me".
I also have two children with non-visible to other people, they're very visible to those who know what they're looking for disabilities so I get the other side of the coin too where I'm realibly informed its all down to parents and a good smack/firm boundaries will sort them out.