O’Reilly Automotive Stores Inc. can’t be held liable for harassment a delivery driver says she faced at the hands of a customer, a federal judge ruled.

The same standard that is used to evaluate co-worker harassment claims under Title VII of the 1964 Civil Rights Act is also used when an employee allegedly was harassed by a client or customer of their employer, the U.S. District Court for the Northern District of Oklahoma said Feb. 19. To establish liability, the...