A Karen is a designation given to a racist white woman who uses her privilege to hinder, oppress, or inconvenience a black individual. They have a sense of entitlement and a superiority complex that they conjure to place black people in dangerous situations often by the use of lying, police, lying to the police etc. This being said, when you constantly label people as Karens without it dealing with their racist actions to leverage themselves against black people, you dilute and take away the focus from the very real issues that black people face in day to day situations. This is sad because this same appropriation of the term and diverting the true meaning of the term seems exactly like something that a Karen would do!
Black man: A Karen almost got me locked up today.
Friend: That's terrible! What happened?
Black man: While I was moving into my nice new house earlier today she called the police on me and lied to them. She took it upon herself to inform them that a black man was robbing the place. She must not have wanted me as a neighbor or she may have been in disbelief that a black person could afford a house that was bigger than hers.
Friend: Wow that's crazy.
Black man: Yeah. The police arrived in 2 minutes flat!