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Their bio said " I don't like you, I flag you" question id, they don't know me nor gave me a chance

It's not personal, it's random, they did the same thing to me and a lot of other people. Try to let it roll off your back. They're just being jerks.

Its just, its disheartening posting quality videos and people down voting you because they have no lives

I can completely relate.

On Facebook, I only unfriended one person ever, but after I posted a piece questioning vaccine science (much of which doesn't qualify as science at all), that guy started posting reams of hate speech on my feed.

He started literally calling me a baby killer because I support parents who don't want to subject their infants to unproven and frequently harmful injections.

This after I included links to clinical studies that supported my stance, and after including anecdotal evidence regarding friends whose children and animals had been harmed, and in two cases killed, by the vaccines in question.

Some people don't want to be confused by the facts.

In any case, I tried reasoning with him, and when it was clear that reason isn't something he recognizes, I unfriended and blocked him, so as to prevent his hate speech from assaulting my friends and family on FB.

And as you say, some simply don't seem to have a life, and take it out on whomever they find online. Sad and frustrating.

Sorry they're taking it out on you, and hope it stops soon.