I hardly get to mix with DS's class mate's parents as I'm at work before he starts school and immediately after, so rarely get to meet them in the playground. I always try to make a really good impression if I have any contact with them as I am just about the only mum that doesn't collect her DC from school (Most of the other children have SAHMs), and am constantly paranoid that I will be seen as a bad mother because of this and because I'm a single mum. (I like to beat myself up about this as often as possible!).
Cue DS getting a Birthday party invitation from a little girl whose parents I have never met. Called just now to confirm, phone was answered by 'little girl', so I put on a voice about 10 octaves higher than my own. 'Oh Hello, is your mummy or daddy home?' I asked in my most patronising child friendly voice. 'Yes, I am Mummy' came the reply.
I am mortified, but couldn't think of anything to say that would improve the situation on the spot, so just mumbled an apology and said it was a bad line.
What a terrible start to a possible friendship - she was a really lovely lady too!