I don't know that I agree with the premise.
There are whole fields of Medicine and pseudo medicine and other things that I consider to be complete bullshit. All I have to do is tell people that. People who don't know me will shrug it off and those who do, will investigate for themselves, to see why I say it's bullshit. My kids will call me up, "Dad I just read such and such, is that bullshit.?" Then I give them an answer, with a very brief explanation. This sort of quick refuting only works with people who trust your opinion.
There are some people whose opinion I trust
enough, that if they tell me a particular thing is bullshit, I may not investigate further.
I have a young brother who disputes things like gravity and the Earth being round. The whole family assumes that whatever comes out of him is bullshit, but sometimes we are surprised.