@audiojan We are in agreement. The phrase bugs me because the phrase "I’m entitled to my opinion" is a fallacy; it is used to preempt or dismiss arguments against their position; the phrase is asserting they have a right to hold their own particular viewpoint. This is a truism. The only interesting issue is whether one has a right to think something based on evidence or justification. In other words, saying someone has a "right to their opinion" excuses them from the rational obligation of justifying their belief. It's perfectly reasonable to avoid debating with people, of course. It may be too conflictual and unpleasant. But just to be clear, there is no "right" they are actually asserting.
Often when people claim a "right to their opinion" they are trying to hold a factually indefensible position or even suggest that everyone has an equal right to be heard on a topic when only one of the two parties has the relevant expertise to determine what is correct.