Admittedly, in the upper class neighborhood grocery stores I don’t see those signs. The areas I see them aren’t shitty though they are fairly high traffic compared to what I assume would be a typical store.
I looked for but couldn’t find a photo of such a sign on DDG. I’ll take a picture of one next time I need to get groceries.
New Jersey, as I said in another reply it’s not a bad area but they have high traffic. I haven’t seen the signs in the upper class neighborhoods grocery stores though.