2. Speed. 1600 km/s is pretty snappy.
Thunderf00t tends to wibble on a bit and repeat repeat himself, but he does make his point.
Relevant bits start about 6m22s.
https://m.youtube.com/watch?v=Z48pSwiDLIM
Or at 10m28s in this video:
Way too snappy. Surely you meant /h not /s
His critiques of poorly-conceived technological concepts, in particular the "Solar Freakin' Roadways" scam, and Hyperloop, strike me as largely on-mark (if repetitious and self-rightous).
I'm not familiar with any Nazi or other associations, though that would be most unfortunate.
RationalWiki addresses some of this:
http://rationalwiki.org/wiki/Thunderf00t
It has no bearing on the technical criticisms addressed above, however.
If he's dishonest (not that he's wrong, but that he's dishonest) about basic social studies why should I trust his science? Let alone his experimental results? To be fair he recently disassociated himself from the alt-right ("not") nazis. So there is that at least.