[onlydarksets]

Is this the only instance? Has your friend been harmed somehow? For example, passed over for a promotion for no apparent reason or demoted for no apparent reason? If not, I doubt there is much here except some guy being a d-bag at work.

Now, if you meant harassment (as opposed to discrimination), then I would be surprised if a single, isolated incident would be sufficient. However, if this has happened repeatedly, then perhaps.

Still, harassment and discrimination are tough nuts to crack. I'd do a little searching around the EEO site.