I agree that all opinions are valid within the context of the person's philosophy. However, when one presents those "opinions" as non-disputable fact, the line is crossed.

Walters "facts" concerning .NET have been shown by the MVP's and experts to be misguided at best and completely fallacious at worst. Prefacing such statements with, "in my opinion", or "i feel" rather than "You can't", ".NET won't." ... etc.