Unfortunately I can confirm his observations. They're all pretty accurate, though those that stood out to me most are:
> Young men in old cars were very aggressive, acting as if to frighten me off the road—they lowered their windows and shouted abusively, waved their arms, and hooted. I did not see this with women drivers and older men in more expensive cars.
I've had so many slurs, usually of the homophobic variety, shouted at me from cars. Some have felt the need to swerve their vehicle erratically at me.
> They tried to put me off balance by suddenly shouting, jumping out of hiding, kicking a football, throwing stones, or riding a bicycle at me; a few asked for a ride in addition to aggressive behaviour.
I've experienced plenty of teens that are aggressive and then proceed to ask for a go.
The positive experiences far outnumber the negatives overall, though.
Yeah, those actual attempts at harm or threats of it was what made me uncomfortable the most. Especially the ones with vehicle, like there is not even any possible benefit of doubt to be awarded. They are not trying to be funny and are full adults.