"Anti-Diversity" is a dog-whistle for a slew of brain-dead progressive groupthink, in the same way that "globalist" is, essentially, an anti-semitic slur.
If you believe that your company should hire the best and most qualified people for the job, you probably hold "anti-diversity" views.
If you do not believe me, below are some examples of "rascist" and "sexist" statements, per the University of Minnesota:
http://sph.umn.edu/site/docs/hewg/microaggressions.pdf
Examples:
“I believe the most qualified person should get the job.”
“America is a melting pot.”
“Everyone can succeed in this society, if they work hard enough.”
“Where were you born?”
“You speak good English.”