You have to be really attuned to "is this actually rational or sound right, or am I adding in an implicit 'but we're good people, so,'"
It accelerated rapidly with some trends like the Tea Party, Gamergate, Brexit, Andrew Wakefield, covid antivax, and the Ukraine situation, and is in evidence on both sides of the trans rights debate, in doxxing, in almost every single argument on X that goes past ten tweets, etc.
It's something many on the left have generally identified as worse from the right wing or alt.right.
But this is just because it's easier to categorise it when it's pointing at you. It's actually the primary toxicity of all argument in the 21st century.
And the reason is that weaponised bad faith is addictive fun for the operator.
Basically everyone gets to be Lee Atwater or Roger Stone for a bit, and everyone loves it.