Why are some on the left (especially far left) so quick to throw false accusations/labels at everyone who don't align perfectly with them politically?

It isn't just Republicans who get's labels and accusations thrown at them, it's independents and democrats too. You dispute the false claims, and they just double down and accuse you of lying while piling on the false labels/accusations. As moderate Democrat it gets frustrating at times and has me second guessing should I leave the party to become politically independent.

Why are some on the left (especially far left) so quick to throw false accusations/labels at everyone who don't align perfectly with them politically?
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