Better suggestion: Be careful when listening to anyone making absolute judgments based on generalizations.
Some operating systems, just like some applications, are better for certain purposes (often because they were designed and built specifically to be suitable for those purposes). "You can do anything with anything" is a very idealistic oversimplification that's implied by the idea that no OS is ever better than any other.
Better suggestion: Be careful when listening to anyone making absolute judgments based on generalizations.
Some operating systems, just like some applications, are better for certain purposes (often because they were designed and built specifically to be suitable for those purposes). "You can do anything with anything" is a very idealistic oversimplification that's implied by the idea that no OS is ever better than any other.