There probably is some truth in where you live/who you mix with being reflected in choices. When I had ds, in 2004, I lived in a very mixed, but mostly deprived town. I commuted to the nearest city to work.
Every single one of my colleagues at work bf and every single one of my friends and family at home bottle fed. It was such a stark division. I bf and it was quite lonely not having others to talk to about it, during my maternity leave I only met one other mum in my local town that bf.
Most other mums I spoke to would be curious and ask about bf as it was unusual to them and ask about it expecting horror stories.
My niece recently had a baby, she has health issues that meant bf wasn't a choice for her, she says it is still the same in a nearby town with a similar demographic, none of her friends, or anyone at baby groups bf.