Where is anyone proposing berating anyone? You can say that a segregated society was
less good than a non-segregated one without saying that everyone who lives or lived in a segregated society is worthy of berating/disgust/derision etc. I don't blame individual Iranians for living in a culture that is worse on many important dimensions than western liberal cultures, but that doesn't prevent me from making a fair judgment that (at least on those dimensions) it is actually
worse.
Modern thinking: things like pluralism and liberalism. These are actual ideas that emerged in the late 1800s and which are responsible for immense human thriving, immense liberation from suffering all over the world. Upstream of all political and social reform is an intellectual reform, i.e. new "thinking." I am not referring to "maximum individual freedom," and in fact this idea is fundamentally in tension with pluralism and liberalism. Maximum individual freedom at the expense of the whole is a bad idea because it yields bad outcomes, just like various forms of theocracy are bad ideas because they yield bad outcomes.
The ideas that yield expanded suffrage, expanded legal protections, expanded access to prosperity are good ideas because they produce good outcomes. Yes sure, the US/the west broadly isn't perfect, etc, but note that we can discuss all the ways in which it's broken so we can get to work fixing it. That's a good outcome and it's a critical part of the path to more good outcomes on more important dimensions.
You're not arguing that other forms get to better outcomes or whatever, you're just arguing that there's no such thing as good or bad outcomes and therefore no such thing as good or bad ideas.
Try going to Qatar or Iran and asking someone for their opinion on their heads of state. I think you'll find their reaction far more chilling than the fact that our health insurance system is broken.