that is probably related to high density population citizens not having as much driving experience (or have picked up bad driving habits) because of congestion.
geography is usually what determines driving skills, race is pretty irrelevant.
You forget that geography usually dictates race/ethnicity. If you're in Asia, you're more likely to find native Asians, are you not?
Therefore, the seemingly racist pet peeve of his is technically right. If people (including native Asians) have a lack of driving experience due to congestion of their native country, and move somewhere else, say, the USA, then as a result of their native country's congestion, they are in fact bad drivers because they are Asian.