The EEOC did rule last year that discrimination by employers or potential employers based on gender identity is a violation of Title VII of the Civil Rights Act of 1964. Here is the Commission's ruling - (LINK). Based on some further research, this is not a binding decision on courts.
"Coach Mattison told me what the Ravens were about, what he thought," Beyer said. "He definitely encouraged me. I hold his opinion in high regard."