Fact vs Opinion

Back to the Dishing. I read, with some amusement, the Disher's theory on the ages of the reviewers. Any regular readers of my Coast column will definitely have some idea on my age, based on comments that I've made. This guy makes statements like "Ms Feltham is younger and has younger friends". See, here's the problem. He states that as a fact, when in fact he doesn't know me and therefore has no idea of how old I am. If he had started his statement with "I think", or "I'm assuming...because..." or "It seems that..." then it would be clear to his readers that he was speculating based on conclusions he draws from the writing, and not stating a fact.
When I do a review, I would not write "Kitchen X is serving dog food", I would write "Kitchen X's main courses taste like dog food". See the difference? The first one infers that I have knowledge that someone in the kitchen is pouring kibble the plates; the second is clearly my opinion as "tastes like" is subjective. Think there's no difference? My comment "Kitchen X is serving dog food" could get me sued for libel (written defamation), whereas I am entitled to express an opinion, as long as it is phrased as such.
Not to say that I could/would sue the Disher for stating conjecture about my age as fact (that would be very Hollywood diva-like). I just wish he wouldn't present his speculative theory as fact, whether or not it's right or wrong.