Enter pharmacy
Me: Good evening, I have a prescription to collect.
Pharmacist: name please
Me: first name surname
Pharmacist: was it sent today
Me: last week.
Comes back with it, checks address and I have my card ready to pay.
As I'm walking towards till she asks
"Does he pay for his prescriptions"
Me 
for a second. "It's mine and yes I do"
Pharmacist: "well I just read the name" with a very defensive tone.
Me: shame you didn't also read the word before that says Miss.
Now I have a name that's unisex that isn't particularly unusual in this day and age (less so than when I grew up!) and people have made presumptions before and it doesn't bother me.
But I was actually annoyed she'd taken the effort to read the name and assume it belonged to someone else - rather than the person actually asking for it - and when I said it was mine act as though I was wrong to say that and retort the way she did as if annoyed at me saying that.
I'm having a rough time at the minute and can be over sensitive so I need the collective honesty on MN to tell me I'm right to have been annoyed or hand me a grip (but kindly 
)