Rupunzel My MW asked me the same thing about fathers when I walked into the booking in appointment with ds2.
She was very embarrassed when I said, yes. (Like having 2 children with 2 fathers is something to be ashamed of 
The "I Don't Believe You" bit was extremely rude though. Not sure what I would have said to that.
Just to add the other side of the "deprived area" groups, I wen to a sure start group in a very deprived area of our town and it was brilliant. Everyone was lovely, watched out for each others children, got involved rather than just sitting around chatting, and closed thermos cups for all so we could have hot coffee without worrying it was going to get spilt.
No particular one person but I went to a supposedly "naice middle class" group once and it was like walking into the lion enclosure at the zoo.
Seriously, the kids were running riot. My normally quite boisterous ds1 was completely overwhelmed by it. One kid in particular running over babies fingers (purposely) in a cosy coupe type car, grabbing toys from other kids if he decided he wanted them and biting the other child if they didn't give it up. His mum would just laugh and say "Oh he's a bit of a free spirit isn't he" 
The playgroup leader got some cupcakes out for the kids to decorate and honestly, it was like a frikkin rugby scrum of parents trying to make sure their child got in there first.
One woman sat there saying "oh the HV has told me I need to get dd off the juice and onto more milk or water, not sure how she expects me to do that though". While her not even 3month old dd was on her lap with a bottle of pure apple juice shoved in it's mouth.
Didn't go back there again.
Tryin out a new playgroup next week with now 2.4yr old ds2. I really hope there's a turtle boy there. Was howling at that image.