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Are they a POS because they posted a racist rant? Or Are are they a POS who happens to have posted a racist rant, thereby solidifying their position as a POS?
If the former, how serious was the rant? Could it be interpreted any other way? Could you contact them and like you say, nudge them towards reeducation?
If the later maybe all bets are off but got knows what they did to you / people to deserve the POS moniker