I do agree that it is very stereotypical and discrimitory to be afraid of a certain breed of dog due to the idiocy of those who own them creating a bad name for said breed. However, you could have tried educating the owner that, even though some dogs of that breed are dogs that will attack others without provocation. The same way that some people think that every person in the world is bad just because a few or most are.

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Off topic:

To those who's emotions are getting flared over an event that someone posted on the internet, take a step back and calm down. For one thing, it's the internet, not real life; for another, arguing and flaming do nothing to help anything.

And the emotions start flying - this is why PT is less active than it was before.