The parties and their surrogates attempt to taint sources as biased and by proxy all content from the source invalid.
We now have data showing that the left tends to read both mainstream and left sources. While the right tends to live in their own little Fox-Breitbart bubble. This means that the right gets news from extremely biased sources with no anchor in reality. While the left tends to read and share a wider variety of media.
It's also been shown that the right is more likely than the left to distrust the fact-bearing mainstream media , because a strategy of the right, as in some authoritarian countries, is to generate distrust in media that they do not control.
So no, both sides do NOT do it equally. The right does way more to taint real sources like the NYT as biased.
 within mainstream I'd tend to separate profit-seeking and independent/family-owned media. But you can lump them together for purposes of contrast with GOP-donor-funded conservative media.
Are you asserting both parties are not guilty or one is more guilty than the other.
In any case I don't think what I said is untrue or was an attempt to mislead.