The masters at this are technical experts at invalidating their own emotions, thoughts and ideas. They pursue a silent convert path of self destruction and self loathing. That energy gets to be too much and must be diverted outward for cathartic reasons hence external invalidations are the result.
Take some time to carefully, very carefully watch the master invalidator at work. This person can be in your family or the work place or part of your peer group. Slow down the static and the noise and pay attention close attention. Once you see the weakness of the masters then you are able to formulate a defense and a calibrated response.
BTW, happy holidays.