That's the biggest load of horseshit that I have ever heard.
Doubting reality is quintessentially scientific.
That's why scientific minds, like Elon Musk, Ray Kurzweil, Max Tegmark, Neil deGrasse Tyson, and many others can all fully entertain the idea. I don't presume you are calling these people mentally ill, drug addicts?
Now, on the other hand, it would greatly behoove propagandists (e.g. the reality t.v. star turned president, Trump) to encourage people to turn off doubt so that they cannot maintain skepticism and detect falsehoods. You wouldn't want the average person doubting reality because then they would doubt the MSM and social websites like this.