OP, you may be feeling quite sensitive post-partum because of your change of circumstances and you are possibly internalising things a little.
In my experience, HCPs do tend to talk to you as though you are about six years old. My midwife knows what I do for a living, yet she has this default manner that sometimes wavers from concerned and caring into a kind of patronising nursery talk.
When it irks you, remember that many HCPs deal with women that do not have a very high level of education or may not even be able to speak English, and HCPs are trained to ensure the basics like not feeding your four week old baby a slice of bread or giving them warm milky tea in a bottle are covered.
For example, one of my friends is a health visitor and she goes to homes where the mothers really have no idea what is happening to them post-partum. No-one has ever told them that women's breasts are used for feeding babies, for example. This sort of thing does tend to influence their approach to the job.
Unfortunately, as so often is the case in modern Britain, people who are capable, and do not have enormous red flags hanging over them, tend to get left to their own devices and their problems tend to be overlooked.
As for your area, it is swings and roundabouts. I live in an ex-council house and half the homes on my street are HA. While my next door neighbours struggle with modern life (I think there are some undiagnosed learning difficulties), we get on very well with other neighbours -- even though we are all very different people. And people can surprise you. One of my neighbours looks like the epitome of a thuggish skinhead, but he is a lovely bloke.
I've lived in areas with people supposedly "more like me", and found it very competitive and weird.
And, to be honest, op, 30 is pretty good to have bought your first home these days.
"I had my 24 week midwife appointment and she wanted to do my carbon monoxide level again (had it done at booking in) when I asked why she said the majority of her patients continue to smoke throughout pregnancy. This is despite me telling her that I haven't smoked in nearly 10 years."
I think this is a requirement for all expectant mothers now -- and they have to do the tests for everyone.