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It's particularly bad when internet users invoke these tropes to hound commenters with minority backgrounds out of a discussion. This has happened more than once on HN in the past, which is particularly shameful and totally against the desired spirit of the site.
I gather from https://news.ycombinator.com/item?id=43632625 that it wasn't your intent, but this is what gets communicated by comments like the parent, whether intended or not. These effects happen all too easily, so we need to guard against them, which is why we have that guideline.
(I'm not taking sides for or against any country or position on a topic. This is about HN being a welcoming place for people of all backgrounds.)