It's not obvious that a bullshitter is "probably worse" than liars. Just because a bullshitter didn't care to research whether some vitamin pill meets marketing claims doesn't mean they're mentally volatile or psychotic. It's a bit of a leap to go from bullshit to asking whether a person lives in the same reality as everyone else.
The idea is that bullshitters are a greater enemy to the truth than liars because liars at least know the truth. You have to know the truth to lie about. Bullshitters have no concern for the truth at all and bullshit may or may not be true. The bullshitter doesn’t care, so long as their goal is made.
A bullshitter most certainly can care about the truth. A lot of people speak on the outer limits of their knowledge, such as when they talk about what's healthy or legal. That does not mean that they will carry on cynically after being informed.
The liar is cynical and is the one who sees the truth and tells you to go the wrong way.
