rac·ism
ˈrāˌsizəm/
noun
noun: racism
the belief that all members of each race possess characteristics or abilities specific to that race, especially so as to distinguish it as inferior or superior to another race or races.
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Tact isn't lying. Tact is knowing how to phrase something in a way that is less damaging to the listener.
tact
takt/
noun
noun: tact
adroitness and sensitivity in dealing with others or with difficult issues.
Notice that it doesn't say lying there. Just being aware of other's feelings.