I see this quite a bit in the industry I work in. People come along and talk with great certainty.
Great certainly about their ability.
Great certainty about how you should run your business.
Great certainty that they have some magic insight which makes their opinion more valid than others.
These people of great certainty also seem to thrive upon the humiliation of anyone who does not agree with them. They claim they’re ill informed, they’re not clever enough. Sometimes they’re just idiots (replace that with a multitude of words filled with more venom).
I find that, given enough time, these people tend to be right about the same amount as everyone else. Their shouting was just that – shouting. Their certainty just a mask they wore to appear invincible.
Don’t be fooled by loud people who proclaim certainty, they’re just making it up, like you are. They’re just as likely to be hit by a bus as you are.