It’s always obvious when a Republican — or a commonsense policy like prohibiting boys from using girls’ bathrooms — gets under the skin of the Left. Musicians let the insults fly, make inappropriate comparisons to genocidal dictators, and behave more badly than they usually do.

Remember how the Dixie Chicks said that they were “ashamed that the president of the United States is from Texas,” in reference to President Bush? They trotted out the propaganda again at a concert in June, showing images of Donald Trump with horns and a tail.

“On the basis of his name alone he can’t be allowed to represent America.”

Cher, apparently tired of being irrelevant, has been relentlessly tweet-bashing the presidential candidate, saying “Trump is as dumb as a mentally challenged fence post” and “racist,” along with plenty of profanity.

Shakira showed her usual class, by keeping her anti-Trump rhetoric to: “No one living in this century should stand behind so much ignorance.”

In the category of “Most Scholarly Criticism of the Republican Presidential Candidate,” we have a four-way tie.

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Marc Anthony cut to the chase, saying at his Madison Square Garden concert, “F*** Donald Trump!” If only he could be that concise with his lousy lyrics, he might have a larger fan base.

Singer/songwriter Romeo Santos did the same, as did Neil “Get Off My Lawn” Young.

Haitian rapper Wyclef Jean kept things equally concise but included an important addendum, saying, “F*** Donald Trump, he don’t like the Mexicans.”

Just to clarify, their responses were to a comment Trump made, which was, “When do we beat Mexico at the border? They’re laughing at us, at our stupidity … When Mexico sends its people they’re not sending their best. They’re not sending you; they’re not sending you. They’re sending people that have lots of problems, and they’re bringing those problems with us. 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 tell us what we’re getting.”

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Not that it matters. Trump could say he doesn’t like brown crayons and be called racist. Musicians during this presidential election are using their concert stages as platforms for politics, preaching to fans about their personal views.

Morrissey offered a very incisive analysis of Trump as a potential president. “Can you imagine the international stage announcing the arrival of President Trump? On the basis of his name alone he can’t be allowed to represent America.”

Others are going further.

Rapper Belly, a Palestinian-Canadian rapper, showed an image of Trump with a Hitler mustache during his set at the recent Hard Summer Festival.

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There’s a sad irony in that Belly’s 2007 album “The Revolution,” included a video for his song “History of Violence.” The images include him posing with men dressed in the colors of the Palestinian flag, his face covered with a keffiyeh — a scarf that has come to symbolize solidarity with Palestinian terrorists. He babbles about oppressed Palestinians. The video also compares Gaza and the West Bank to post-Katrina’s black population in New Orleans.

Rap artist Tyler Gregory Okonma — aka Tyler, The Creator — debuted a new design for one of the shirts in his Golf Wang line using a similar image of Donald Trump with the dictator mustache. There is a sad irony here, as well.

Tyler was banned from the U.K. last year for the content of his 2009 and 2011 records, which “encourages violence and intolerance of homosexuality” and “fosters hatred with views that seek to provoke others to terrorist acts.” Maybe Tyler, The Creator can create a t-shirt that reflects this boo-boo.

Related: Dear Celebrities Who Support Black Lives Matter …

Let’s get something clear. One can criticize Donald Trump. One can hate Donald Trump. One can refer to him as many things. However, there is zero comparison to be made to 1930s Germany.

Weimar Germany was in the throes of political upheaval after World War I. The country suffered through $5 billion in reparations, a hyperinflation that destroyed all wealth, frequent outbreaks of violence, and an attempt to overthrow the government in 1920.

Hitler was a madman suffering from numerous deeply destructive psychological disorders. Coupled with the highly specific circumstances occurring in Germany at the time, he concocted a witches’ brew that poisoned the world for years. Perhaps ignorant popular culture figures, and many Americans, should research history before making proclamations that sully the memory of the deaths of millions of innocents.