How is what I said racism? It's maybe culturalism, and weak if that. It might have been very sad that Ottomans have once conquered Constantinople, or that Anglo-Saxons displaced Celts and were in turn conquered by the Normans, or that Romans or Arabs conquered Jerusalem and then later after a bunch of other people Israelis have (re-?)conquered it, or that China controls large parts of what was historically Mongolian land after the Mongols used to control a bunch of China, or whatever. The race has nothing to do with it. Wars used to be normal, and still are to an extent, however unfortunate that is. The fact that somebody conquered somebody 200 years ago and broke treaties has no bearing on anything whatsoever.
Or, if you think it does, it's YOUR job to articulate how, but in a manner than can be applied consistently in the general case, e.g. for the examples above.
I can't respond to this specifically unless you give specific links. Sometimes, there are extremely bad comments which we've missed—we don't come close to seeing everything that gets posted here (https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que...). Other times, though, people put extreme labels on comments they don't like, and basically want us to ban everyone they disagree with. Also, no matter where one draws the lines, there are borderline cases that require judgment calls and interpretation, making it impossible to please everyone.