@glitterbag,
While you sit at the knee of the great psychoanalyst Gbag learning about the dread spectre-the invalidator- you may want to consider a second theory. Imagine that a bunch of assholes who don't like your political opinion - instead of poking holes in your opinion - say you're lying about it and pretending to be someone you're not. It would piss you off. They do this same thing for months, congratulating each other and resisting any thought to actually think about what they're saying.
It happens. No big tragedy.
However, when you decide you should repay the favor, you first look at their weaknesses, don't you?
When those weaknesses GLARE OUT LIKE A FLASHING NEON SIGN, you go for what you know, right?
So, you can buy the admittedly brilliant invalidator theory, or you can admit to yourself that as long as you dish it out, you better improve your ability to suck it up, cupcake.