People should be critical of what they read of course, however, saying stuff like:
people need to be aware of the possibility that what they're reading has been shaped by troll farms
allows later to accuse any person on the internet of being "paid shill", or "Kremlin troll" - if you don't like what they write. If director of FBI said that, then it must be true! Paid trolls are all around as! Don't believe anything you read, except what government tells you!
As result then it would not possible to express any criticism toward certain groups. For example, if I would try to criticize FBI director - saying that it looks like he is friend of Hillary, and tries to discredit Hillary's political opponents, after she lost. Then, someone could say - aha! that's what Trump/Putin troll would say! You are paid shill! Basically, if you criticize Hillary and her team - you are automatically a paid troll, and now you need to prove you are not, which is impossible.
I'm not from US, I'm from Ukraine, and I like to make some political comments, and I was accused of being a "bot" multiple times, and all times completely without any evidence. Or if there is "evidence", it's mostly "you already made a political comments on similar topic" - what a surprise, people can have a certain interests, and like one topic more over another! But mostly it's - "you made comment against our political group, or in defense of other political group - you are paid troll"!
Sometimes even disclaimers like "I don't like Trump, but Hillary..." or "I don't like Putin, but Ukraine..." doesn't work, people still claim that you are pro-Trump, pro-Putin troll etc. Like it's not possible/allowed to be critical of both sides.
And all these articles about "troll army" doesn't help, and they are basically a bullshit, in a sense that they all are just broad accusation of anyone whose opinions goes against of popular opinion. And it's really bad if you think about it, they trying to convince that people with different opinions are potentiality not a real people, that they just don't exist.
Of course there is propaganda from every side, and people lie, but I think people just should be critical of what they read, and be honest not to dismiss automatically comment if they don't like it, but evaluate it.