even a sum of anecdotes do not make a statistic.
Consider your logic:
I slept with a black guy with a large cock; he wasn't a porn star, therefore all black guys have large cocks.
Consider this logic:
I cooked with a Mexican guy who had an aversion to spicy food; he wasn't a chef, therefore, all Mexicans are adverse to spicy food
And to keep skipping down the ethnic road:
I slept with a Chinese man. He was larger than average, therefore all East Asians are larger than average.
Or, I know two baseball players. They are both fine athletes. They are both Jewish, therefore all Jews are athletes.
(Is debate a sport? Because if it is, and I lettered, I am an athlete.)