It is sometimes assumed, at least in popular discourse, that if different groups have different ways of doing things, they must all be equally good ("valid"). Consequently, if some way of doing things can be associated with one group in particular -- if it's categorizable as "Western", say, or "male" -- then there is no reason for anybody else to care about it. Each community has its own values and practices, immune from criticism or improvement. The only universal principle is that one must not judge others.
This is silly, though of course there are reasonable sentiments in the vicinity. One should not pre-judge others. (But that needn't disqualify considered judgment.) A practice should not be dismissed because it is non-Western, or whatever. That is no reason. (But that doesn't preclude there being other, legitimate reasons to criticize a practice that happens to be common among some minority group.) We should not force our views on others. (But such tolerance is perfectly consistent with vocal, reasoned disagreement / criticism.)
Note that it is not a priori that everyone is living equally well. It's entirely possible that some ways of life are better -- more conducive to human flourishing, "meaningfulness", and other important values -- than others. So it's worth trying to discern which are which. (Though of course we must go about this with the humility appropriate to fallible agents seeking facts that lie beyond our mere subjective opinions. And, epistemic virtues aside, there's no need to be a jerk about it.) As with anything else, the way to pursue this inquiry is through rational thought, and reasoned discussions with those who believe differently from us.
It is possible for us to learn from one other, if we are not afraid to voice our disagreements and discuss them reasonably. It would be a better world, I think, if this was more widely accepted. But if you disagree, do feel free to criticize and tell me why.