Indeed they are, bit not all opinions are equal. If you have cancer, the opinion on treatment of the consultant oncologist with 40 years experience is worth listening to. The opinion of Vera who works in Poundland, not so much. But she thinks you should heal yourself with crystals, and she's entitled to her opinion.
That's not opinion vs opinion. It's fact vs opinion.
When talking about racism, the opinion of a white, upper middle class, successful actor, from a wealthy background of other successful actors, isn't worth a wank. Debatable. We should all say what we think.