Musician Willie Nelson said Tuesday that he's not bothered by the fact that many of his fans are boycotting him because he's headlining a rally for Rep. Beto O'RourkeBeto O'RourkeEXCLUSIVE: Trump on reparations: 'I don't see it happening' Overnight Energy: Inslee unveils plan to fight fossil fuel pollution | Poll finds Biden top choice for climate-minded voters | Trump USDA reportedly buried climate warnings Inslee unveils plan to fight fossil fuel pollution, ban fracking MORE (D-Texas) later this month. 

"I don’t care," Nelson said on ABC's "The View. "You know, they’re entitled to their opinions and I’m entitled to mine." 

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Nelson added the he's been supporting Democratic lawmakers his entire life and that he didn't know why this latest event sparked outrage from a contingent of his fans. 

"Everybody has an opinion," he said. "Everybody has a right to an opinion." 

O'Rourke, who is running to unseat Sen. Ted CruzRafael (Ted) Edward Cruz Hickenlooper, Bennet bring deep ties to 2020 debate stage 2020 Democrat Bennet releases comprehensive government reform plan GOP frets about Trump's poll numbers MORE (R-Texas) this November, announced last week that Nelson would headline a rally in Austin, Texas on Sept. 29. 

Rolling Stone reported that the appearance from Nelson would mark his first-ever public performance on behalf of a political candidate. 

Fans quickly took issue with the announcement, with many posting angry comments on the singer's Facebook page, where he had shared a post on his plans to headline an event for the Democratic Senate candidate. 

“Open your eyes Willie!” one user said on his Facebook. “Beto is a Socialist who probably has lied to you. This is a real shame you support him.”

“I am no longer willing to watch that hippie guitarist who supports that … socialist running for Senate,” another user said on Twitter.

Nelson in a statement said he and his wife "share [O'Rourke's] concern for the direction things are headed" in the U.S. 

While Texas has not elected a Democrat to the Senate in three decades, polls have continued to show that Cruz and O'Rourke are in a tight race. 

An average of polling produced by RealClearPolitics shows Cruz up by 4 points. The Cook Political Report rates the race as “Lean Republican.”