[omer_balyali]

You're not condescending; you were trying to explain to a person who is not qualified to screen you. It's a billion-dollar business, and they're hiring engineers, so they're not picking up apples at the grocery store. Even if you would apply before they contacted you, there is no excuse that they don't know what they're talking. You don't have to be gentle to excuse someone else's illiteracy. He/she is not your friend or your family, this is a business.

You screened the recruiter well, and he/she failed to continue. Best luck in his/her exactly-UNIX-and-not-UNIX-like engineer search!