Iowa 80 Truck Stop interview questions

The job description only mentioned "Candidates must be authorized to work in the United States without current or future sponsorship." , which means both U.S. Citizens and Permanent Residents/Green Card holders are eligible to apply. But the recruiter scheduled an interview and asked if I was an U.S citizen and she mentioned that they don't "sponsor" green card holders. When in fact green card holders don't even need sponsorship at all.She didn't know the meaning of sponsorship and refused to speak further. The interviewer was ignorant and rude.