To be fair, I can see Evey's point, though at the same time I can see (and agree with) yours.
I don't have a visible disability, but sometimes I will either feel bewildered in public, or I'll act 'unusual' or 'childlike', which sometimes means people will treat me in what feels like a totally patronising manner. Luckily I'm articulate enough to brush it off quickly.
Thing is, it's probably not them being deliberately patronising, but just trying to put you at ease the best way they know how. They're not trying to draw attention to you at all, Evey - they're trying to help a disabled person, as they're instructed to. They probably have to do it all day for auld folk, y'know?