If the value of listening to someone is the signal of their message, like an indicator for day traders, then the consistency of the signal should be what makes someone worth listening to.
In today’s society people have got this confused, and only like listening to people that agree with them consistently, and are quick to call someone as having not a single good idea. But that would go against logic, if someone is consistently wrong on all topics, then you should listen to them as much as someone you agree with constantly, because you can just invert their message.
What would be a better insult to your opponent would be to insinuate there is no rhyme or reason to their messaging and there is no way to know if what they say is right or wrong - rather than that they’re wrong all the time.