Here’s another example:

https://www.snopes.com/fact-check/blm-terrorist-rosenberg/

> In the absence of a single, universally-agreed definition of "terrorism," it is a matter of subjective determination as to whether the actions for which Rosenberg was convicted and imprisoned — possession of weapons and hundreds of pounds of explosives — should be described as acts of "domestic terrorism."

It should go without saying that there’s no single, universally agreed upon definition of anything, thus giving a convenient way to dismiss any inconvenient claims.