Read it again. Anyone who puts this in writing is too stupid to teach kindergarten, let alone university courses: "Many female professors in Germany decided to no longer accept male indian students for these reasons, and currently other European female association are joining".

You still haven't offered a shred of evidence that he actually made the cut for that lab. Why is he entitled to work there?

Let us say he did not made the cut based on his profile- How on earth does that justify her email ? Why won't she put the real reason for rejecting him, if there was any, instead of a oversimplified generalization based on the country of origin.