The way I read the original comment was that almost everyone held different values. That says nothing about diversity—those different values might be (reading between the lines, are) all more or less the same.
Put another way: it's not a matter of living where "everyone agrees with you" but where "not everyone disagrees with you". Those aren't the same!
Diversity of ideas is definitely a good thing, and, unless you hold fringe views, it means a fair number of people do agree with you. If everyone disagrees with you either you're a real outlier or, more likely, there is less diversity of views on that particular axis.
Put another way: it's not a matter of living where "everyone agrees with you" but where "not everyone disagrees with you". Those aren't the same!
Diversity of ideas is definitely a good thing, and, unless you hold fringe views, it means a fair number of people do agree with you. If everyone disagrees with you either you're a real outlier or, more likely, there is less diversity of views on that particular axis.