Seems to me that everyone is entitled to air an opinion.
One expressed in the absence of or contrary to available facts appears to invite some dispute.
Subsequently turning into a dick because a factless or fact-fighting opinion is questioned seems to be frowned upon...particularly the fifteenth or sixteenth time it happens.
Be fearful when others are greedy, and greedy when others are fearful. Just another form of "buy low, sell high" for those who have trouble with things. This rule is not universal. Do not buy a 1973 Pinto because everyone else is afraid of it.