Celebrities in general are quite dubous. See a certain actor suddenly promoting Palantir spysniffing on mankind. I decided that guy won't get a dime from me for the rest of my life - when actors suddenly become lobbyists for Evil, they need to not get any money from regular people really.

This is just normal not supporting things you disagree with. It's not a rule of thumb you can quickly use to discount an opinion. Ignoring actors is a pretty handy rule of thumb. Their main skill is repeating someone else's words and emoting. There is no reason to consider them smart, knowledgeable, informed, or competent.