There’s an old phrase among critical thinkers: you’re entitled to your own opinions, but not your own facts*. The idea is that these are two different things: opinions are matters of taste or subjective conclusions, while facts stand outside that, independent of what you think or how you may be biased.
You can have an opinion that Quisp cereal is, to you, the best breakfast food of all time. But you can’t have the opinion that evolution isn’t real. That latter is not an opinion; it’s objectively wrong. You can have the opinion that the evidence for evolution doesn’t satisfy you, or that evolution feels wrong to you. But disbelieving evolution is not an opinion.
The same can be said for many other topics of critical thinking.
Deakin University Philosophy lecturer Patrick Stokes makes just this case in a well-written piece called No, You’re Not Entitled to Your Opinion. For his basic example of this he uses the modern antivaccination movement, specifically Meryl Dorey and the Orwellain-named Australian Vaccination Network, or AVN.