Of course, but very often that's irrelevant. If someone is expressing their opinion about something, it doesn't matter at all whether or not that opinion is in the minority. It's still their opinion and as such, is as valid as any other opinion. To reply to someone expressing their opinion with "but you're in the minority" is just a way of saying "but what you think is meaningless". Which is both overly dismissive and untrue.

If someone is saying "I think this, and therefore everyone thinks this", then how common their opinion is becomes relevant.