And I firmly disagree with your overall point; there are many, many young fascists/far-right people out there, but they are less likely to self-identify as Nazis (paleoconservative, classical liberal, identitarian, etc) Furthermore, the online space is going to favor the left; there's probably tons of fascists out in Arkansas or something that won't be online.
And we're just talking about young people; factor in the old generation and it isn't even close.