How do we deal with stupid Armchair QBs telling you what you know that you know and they make internet posts calling you a fraud and such?

stupid troll joined my youtube video and accused me of lying about my martial arts experience. What the hell does he know? He's never met me in my life.

Same deal on Quora. Stupid troll doesn't know what he's talking about, and he steals my views and my readers by simply calling me a fraud every time I type something.

And yeah, I'm out of shape and overweight now, because I've had 4 TIA events in the past 12 years in total, and I'm lucky I haven't had a full blown stroke. Thank God anyway. Stupid guy wants to use a "poisoning the well" argument, because of my illness, to claim that I'm a liar about my ju jitsu experience.

How do we deal with stupid Armchair QBs telling you what you know that you know and they make internet posts calling you a fraud and such?
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