Yeungling, Eric Trump

Eric Trump, son of Republican presidential candidate Donald Trump, poses for a photo with Yeungling brewery owner Dick Yeungling on Monday, Oct. 24, 2016.

(Twitter | @EricTrump)

Yuengling is finding out that beer and politics don't always mix.

Donald Trump's son Eric Trump toured D.G. Yuengling & Son in Pottsville, Pennsylvania, with owner Richard "Dick" Yeungling, Jr., earlier this week. Yuengling thanked him for visiting America's oldest brewery by announcing his family-owned business is endorsing the fellow billionaire for president.

"Our guys are behind your father," Yuengling told the Republican candidate's son in front of media. "We need him in there."

As a result, some beer fans have begun boycotting the company, once praised by President Barack Obama as his favorite.

Todd Bird, of Kentucky, said on Twitter he used to drive 90 miles regularly to get the popular lager in Ohio, "but supporting racist, misogynist nut-job Trump is the end of the line for me."

"Is nothing sacred? Yuengling supports Trump. What other good low price beer is out there?" another user tweeted.

The Washington Post reports some bars in Washington, D.C., have stopped stocking the brew. A gay nightspot called JR's posted a video showing the Yuengling handle being removed from the tap.

"Just so you know, when people support things that don't support us, then we don't support them," JR's manager David Perruzza said in the clip on Facebook. "So goodbye Yuengling, you are the weakest link."

Fortune reports Pennsylvania state representative Brian Sims, who is openly gay, said he is done with the beer-maker after being a customer for 17 years.

"D.G. Yuengling & Son, Inc. believes that an agenda that is anti-woman, anti-immigrant, anti-LGBT, anti-racial minority and anti-equality is best for them and that tells me all I need to know about what they think is best for their own customers," Sims wrote on Facebook. "I'm not normally one to call for boycotts but I absolutely believe that how we spend our dollars is a reflection of our votes and our values!"

Trump supporters, on the other hand, praised the endorsement.

The Post compared the controversy to past informal boycotts against Chick-fil-A, which drew criticism in 2012 when its president spoke against same-sex marriage, and Target for its opposition earlier this year to North Carolina's anti-transgender "bathroom bill." According to the newspaper, Target saw a 7 percent sales drop in August compared to a year earlier, but there was no evidence it was connected to conservatives boycotting the brand.

When asked for comment, Dick Yeungling, a lifelong Republican, told Fortune that he would happily welcome Democratic presidential candidate Hillary Clinton on a tour of his brewery, but declined to say more.

"I've said enough," Yeungling said.