What subtle behaviour is an indicator that someone is not a nice person?

Online or in real life.

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They ridicule and condemn people for something that doesn't harm anyone.

Like my husband’s family. They always do that. We don’t do that. @CrazyMusicLover

@Spoiledbrat I know many people, including my family who do that. :/

I’ve observed my husband’s family do it for years. @CrazyMusicLover