Because the Teamsters, like many blue collar workers, are racist and sexist Trump supporters. It really doesn’t need to go farther than that.
https://www.theguardian.com/us-news/2024/jan/31/teamsters-racial-discrimination-lawsuit
https://finance.yahoo.com/news/teamsters-hurled-sexist-anti-muslim-154544490.html
And reveals his big announcement on Obama’s birth certificate.