[MispelledToyota]

The question was about how someone should form their opinions, and whether we can tell others how they ought to do that. Lots of our opinions do affect others (e.g., if they should be hired, if one should help them, how we treat their reputations), so it's appropriate to point out what good and bad criteria are.

If an opinion being held doesn't have any practical ramifications for others, it's not really a big deal to have opinions formed on a questionable basis, except that good judgment tends to be a habitual process, so doing it with bad criteria with low stakes could affect how we form them when the stakes are higher.