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The phrase "all lives matter" is an obvious parody of "black lives matter" that effectively serves to minimize well-documented and disproportionate per-capita violence against African-Americans by US police. To those who have seen and experienced the effects of this violence first hand, those comments likely come off as petty and out of touch with reality. This may be a reason why people don't want to voluntarily associate with someone who would say/write "all lives matter".