I swear my DCs birthday was a fail because of my postcode. Stuck up snooty mums who think I was just a 'career single mum'.
Its split 50/50 here too. With a good mix of property types (2-3 bed houses, 1-3 bed flats and retirement bungalows) so its not limited to one group - big families, couples or elderly iyswim.
I love it esp for the fact, although I live on an estate I have protected woodland right on my doorstep. You don't get that buying an overpriced Victorian town house that are a pain in the arse to keep warm with a postage stamp garden and neighbours so close you can hear them breathe ;)
People do make assumptions if you live on an estate. Everything from your marital status and the number of fathers your children have, level of education, whether you claim benefits and if you do the assumption you don't deserve them or are fiddling the DWP 
The week I moved in my own neighbour made a judgement about me because I was single and had a baby. Assumed I just did it to get a house and they are the social housing tennants!
I think what it is is people feel miffed If they think they are missing out - why they judge you - A kind of jealousy maybe even envy because you have something they feel they deserve. Its daft because you are working just as hard as they are usually with more difficult circumstances or a more difficult start (usual reason for getting social housing) and are just doing your absolute best to get on in life just as they are. But cash/earnings/money are relative. If you have more you spend more and feel just as poor as those working just as hard in low paid work so the resentment towards poorer folk is magnified because they should feel richer but they dont and because of that they feel they too should be given a 'break' even though they have had it and they cant see it.
Anyway, rambling thoughts on it again! but yes, people will always judge you no matter what walk of life you are in. rich, poor, educated or not. Its shit.