What do you think one can do, to educate those young ones, And drive the point that with all honestly, Bitcoin isn't as bad as they think it is?
Have a dialogue with them. There aren't lots of things to do. Essentially what you're asking is: how can I make a conversation with a biased person? Apparently,
by doing it. Explain them the FUDs, counter-argue to energy waste, criminal activity, mining pool oligopoly, ponzi scheme narrative etc.
End the FUD.
Tell them legit information about bitcoin, if they will try to oppose it, then I think you cant do anything about it anymore. Learning is best done when there is willingness, but if they keep on believing that bitcoin is a Ponzi scheme, bitcoin is not legit, then leave them on that. Its not the loss of bitcoin actually nor the bitcoin community, biased persons will always seen regretting in the end.