The real reason nobody cares about JonTron's white nationalist rant? Because nobody actually cares about JonTron.
The recent non stop shame/clown parade of Carl Benjamin would tend to reassure me that YouTube penetration into the "real world" has still some way to go.
I was going to point out that seemingly all of eras opinions are based on recycling what they watched some youtuber say, but then I realised that doesn't counteract your point in the slightest
e:
It also goes a long way to explaining how come they act like they've suffered a crisis of faith when some youtuber says or does some stupid shit, when you realise they don't treat these people as just some joe shmoe saying shit on the interwebs, but as personalised spiritual gurus
I mean, it would be silly of anyone to dismiss the influence of YouTube as a whole on popular youth culture... but someone like JonTron might as well be a cable access channel TV host for all the amount of actual influence he has on anything, especially as personality driven sketch content is being eclipsed by pop culture assimilated content and live streaming.
Nobody is going to fall into a rabbit hole of white nationalism based on JonTron's Trover advert, and this is important, UNLESS THEY FIND THE ERA THREAD in which everyone associates JonTron with white nationalism.