First post, because this is one of the most strange situations I've been in! 
So, I'm Asian and DH is white. DH has started a fancy job and has a new load of friends and colleagues. We also recently moved back to the UK after living abroad for a while, so I hadn't met some of DH's friends. DH went to posh schools and his friends have £££ (this I think is relevant). Also all of them are white (also relevant I think). DH thought it would be fun to have a get together with his friends, co-workers and their kids. All fine.
So day of get together comes. My sister is staying with us and we were together at the back of the house, so when the doorbell rang DH was already at the doorstep with a whole load of people who had arrived in a group. Much hugging and laughs. So, me and my sister step forward to greet them with DS on my hip and DD trailing after me and two of the moms say to their kids "There, off you go with the nice lady!"
Then, some other people start going to hand my sister their coats.
DH bursts out laughing and introduces us. Said people turned pink and were very awkward with me for the rest of the night. 
I have made my displeasure known and DH reckons this is just a funny situation and I'm overreacting. I think it's dodgy as heck that this lot assumed that we were the help!!