Please look at the way it is being used and the spirit of those using it. Simply because I am a white woman, I am dismissed outright as a Karen every time I have a complaint or unpopular opinion online. It has nothing to do with looks, income, our marital status (I am an unmarried pauper who doesn't look anything like the purported picture), though I am assumed to be entitled and thus my thoughts are prejudged as unworthy of consideration. Look at the other comments on here for example. Look at the spirit and intend behind it's usage, which serves to discredit, shame, and shut-up a whole segment of people.
This is a dangerous and hurtful paradigm, and functions similar to racial and ethnic slurs of the past.