WATCH: CBS guest whitesplains 'Black Lives Matter' to Gwen Ifill by likening it to Donald Trump

Washington Post columnist Ruth Marcus argued over the weekend that the "Black Lives Matter folks" represented "unreasonableness on the left" just as Republican presidential candidate Donald Trump had embarrassed the Republican Party.

During a panel discussion on CBS News about how Republican candidates were reacting to Trump insulting Sen. John McCain's war record, Marcus suggested that the candidate had attracted anti-immigrant supporters who were mirrored by opponents of police violence against the black community.

"There's one other thing that happened this week that I think we should talk about," she interrupted. "This really bizarre encounter that Bernie Sanders and Martin O'Malley -- the two other Democratic candidates -- had at Netroots Nation."

"You have this segment of the Republican Party that seems to be semi-large that's supporting Trump, but then you had on the other side," Marcus continued, motioning to PBS broadcaster Gwen Ifill, "being shouted down while they were denouncing billionaires, while they were calling for an increase in a the minimum wage by the Black Lives Matter folks. And that was just this sort of outburst of unreasonableness on the left side of the party."

According to the Washington Post columnist, the Democratic candidates were "saying things that the base should be cheering, but there is a group shouting them down during their speech because they are not talking only about black lives matter."

"Or at all," Ifill pointed out. "To be fair."

"Well, they might have gotten to it on their own," Marcus speculated. "It seemed to me, watching this week, it was like the extremes of both parties had some kind of secret meeting where they got together and said, 'How can we most alienate normal voters?'"

"And they did a pretty good job," she concluded.

Watch the video below from CBS' Face the Nation, broadcast July 19, 2015.