Indeed.
I have to thank my military service, 25 years ago, for giving me some insights into that phenomenon.
Suffice to say, I was really surprised by the views of large parts of the population of my country, that I had not had the opportunity to closely encounter before (not that I would search out that opportunity again later, at any rate).
One isolated example would be that among the strategies of discussion and communication, I was not aware that there are people who do consider simply punching another person you do not agree with in the face as a viable communication / discussion strategy. (You might consider this factoid when reasoning with people from social groups you do not encounter on a regular basis)
It certainly helped me to understand some of the results of democratic elections that I did not really approve of, later, and also to accept that some rather surprising demographic statistics might really be true (e.g. the average number of books read per year per person, or the average frequency of change of underwear, and so forth).
So, yes, as far as I know, there are many people out there who can be described with a term like "Chav" or similar.
They might be really nice, when known on an individual basis, but ... still different.
"
