What I meant by that is they intentionally distort the facts, selectively choose which facts to present in order to make Trump look as negative as possible, no matter the actual truth. I will give 2 examples, one long one short.
Short: How many people think Trump has gone personally bankrupt versus having business ventures going bankrupt? How well has the MSM been in explaining this very important difference and why it matters?
Long: On illegal immigration Donald Trump said:
Ignore the troll at the end of the video.
“When Mexico sends its people,” Trump said during his presidential announcement, “they’re not sending the best. They’re not sending you, they’re sending people that have lots of problems and they’re bringing those problems. They’re bringing drugs, they’re bringing crime. They’re rapists and some, I assume, are good people, but I speak to border guards and they’re telling us what we’re getting.”
So not all Mexicans, not even all illegal Mexicans but a subset of illegal immigrants (“some I assume are good people”) .
Now let’s look at how it was reported.
NY Times:
Mr. Trump’s claim that illegal Mexican immigrants are “rapists,”

Opinion | Donald Trump and the Rise of the Moral Minority (Published 2015)
The success of his campaign so far exposes a rift within the evangelical movement.
No a subset of illegal Mexican immigrants
Huffington Post:
He Called Latino Immigrants “Criminals” And “Rapists”
now it’s ALL latino immigrants legal or illegal.

9 Outrageous Things Donald Trump Has Said About Latinos
"They’re bringing drugs. They’re bringing crime. They’re rapists."
Washington Post
He referred to Mexicans as “rapists,”
Now it’s all Mexicans

It’s not chaos. It’s Trump’s campaign strategy.
Behind the Republican front-runner’s string of headline-dominating controversies: discipline and method.
Time Magazine:
Trump’s comment that Mexican immigrants are “rapists,”

How the Past 50 Years of Immigration Changed America
59 million immigrants have entered the country since a 1965 reform
Associated Press
Trump called Mexican immigrants rapists and criminals
LA Times
days after describing Mexican immigrants as “rapists” who were bringing drugs and crime across the border.

Calls for 'SNL' to dump Donald Trump grow louder
Donald Trump is scheduled to host "Saturday Night Live" on Nov. 7, but if a growing chorus of critics have their way, he won't be.
Fortune
branding Mexican immigrants as criminals and rapists

Donald Trump’s SNL hosting gig is a new low in U.S. politics
NBC invited Donald Trump to return as guest host on SNL Nov. 7, and it says a lot about America's political culture.
Hollywood Reporter
June 16 speech, during which he referred to Mexican immigrants as “rapists.”
ugh… it goes on and on like this
CBS News
Donald Trump defends calling Mexican immigrants “rapists”

Donald Trump defends calling Mexican immigrants "rapists"
With several business ventures in jeopardy over the comments, the GOP candidate isn't backing down: "Somebody's doing the raping"