For my job, I often have to speak at conferences and events sharing aspects of my research, or being asked to comment about certain topical issues.
I make a fairly concerted effort to be as neutral as possible and rely on what the available data is telling me - in fact, my talks are often specifically about something called "material agnosticism" (there is no such thing as a good or bad material, it depends on the context and application in which it is being used). It is a position that is gaining a lot of traction in the product design space, as it doesn't ascribe value based characteristics to something like plastics vs. paper.
On several occasions now, I have had members of the audience make baseless claims completely divorced from scientific reality. The most recent examples were about micro-plastics - at one conference, an audience member said "Microplastics cause heart attacks". The exact opposite occurred at a different event, where somebody claimed that microplastics don't exist. Trying to explain to people what the data is actually suggesting is a fools errand. They either accuse me of being a paid shill, or that they read their own trusted sources (usually on reddit/facebook/youtube).
I don't go into a mechanic and say "I know more about fixing a transmission because I watched a youtube video", so why are these people with no background questioning my knowledge? It takes every ounce of restraint not to call them retarded, and I am forced to be conciliatory and feign respect for their opinions.