This is unnecessarily antagonistic. People are allowed to bring their personal experiences to the table, and just because you don't think that those, alone, change the big picture - which is a perfectly reasonable thing to point out - that doesn't mean that they should simply not share those experiences or the opinions that are informed by them. It certainly doesn't make them "ego(tistical)", "irrational", and "selfish". There's just no reason to treat people this way.