Being right is rational.
Rationality really focuses on the validity of the justifications constructed as the argument for something. A rational premise can indeed be wrong, but that is because it is based on valid justifications that turned out to be untrue.
Validity and truth are not synonyms.
Just as rational may not always be right.
Anyone arguing their opinion is more rational before ever hearing your opinion doesn’t really know what they are talking about in the first place.