Actually, it doesn't work both ways.
Yes, it does.
In one scenario, someone points to the product of a professional and says "This is what the professionals believe." They don't have to have credibility in the subject because they are not questioning the quality of the professional's work, they are simply referencing it. In the other scenario, someone points to the product of a professional and says "The professional's work is flawed."
It's the difference between saying "The doctor says John has cancer" and saying "The doctor's conclusion that John has cancer is wrong even though I haven't examined John and I don't have any medical training."
A few things to point out.
1.) You are making an appeal to authority, which is a common logical fallacy and one of the most common tactics used by people who have actually done no research on their own. Most of them have not even read beyond the headline of the article they link to. More on that later.
2.) You are comparing hard science to soft science, which is not comparable in any way. Hard science is based on causation. Questioning a medical expert or a chemist on how certain chemicals interact with each other is in no way similar to disagreeing with a philosopher or his opinions regarding human behavior, or with a social "scientist" who has an opinion on the correlations found in data readily available for anyone to look at. And you should be ashamed for even attempting to make such a comparison.
3.) Since you have provided no links or no research whatsoever, you have no room nor right to claim anyone is an expert on anything, since you haven't actually made an argument or substantiated it at all, whatsoever.
For the last person who did actually give me a link, well, let's take a look at that:
http://www.chicagotribune.com/news/...-colleges-perspec-0811-md-20170811-story.html
It was posted as evidence that "affirmative action was created to pit minorities against each other." Now even a cursory reading will reveal that (a) this article argued the opposite of the original poster's claim, and (2) the person who authored the article is indeed *not* an expert. The author is a journalist. That's his educational and professional background -- journalism.
Are you telling me that neither I nor anyone else has any right to question the judgement, qualifications, or intellectual rigor of this author? That his assertions must be taken at face value?
You are coming out on the wrong end of this argument, and if you didn't know it already it should be dawning on you now. Please either make an argument and back it up or stop posting. Windmilling at people attacking sources you never provided to disprove an argument you never made is absurd.