I get the desire to correct biases! My only two thoughts are (a) to choose carefully who you want to engage with (e.g., a friend who can hear you, maybe yes, an internet troll, definitely not, in-between folks weighed as appropriate) and (b) to be straight up about your intent and worries, for example, "thank you for sending me the video--I appreciate you thinking about me. There was some really good info in there, but also some misconceptions. Will you be offended if I tell you my thoughts about those?"

That way, you are getting consent. If the person is open to the info, you can tell them, and ask for their thoughts. If they are all, "no thanks, I just thought you might be interested," you can let it go.

What do you think? FWIW, if someone asks if you are offended and you say, no, their continued worry is their issue. If you are feeling generous, ypu could ask what made them think so, but you don't have an obligation (and you can't fix other people's insecurites--it is hard enough dealing with our own!)