The meme ‘don’t pass judgement on other people’ is, I think, pretty widespread in North America and maybe more so in Canada [...]

Insofar as it actually exists, this is a very context-dependent principle. As someone who grew up in a moderately alien culture, I perceive a strong note of frightfully stern judgmentalism in the Anglo-American culture. (Of course, the exact range of issues on which this judgmentalism is manifested depends on people's ideological position.)

In fact, the way it is expressed in North America, even the "don't pass judgment" attitude itself paradoxically often strikes me as sternly judgmental. Admittedly, sometimes I perceive it as an expression of a pleasant and easygoing disposition, but more often, it looks more like a harsh moralistic condemnation of those who differ ideologically and thus express disapproval of different things.