Me :: Graduate school is such a lonely place. All everyone has time for is work. My advisor:: Oh, you should get some Mexican friends.
Is this a joke that you are attempting to make?
It's a joke. You're not getting it.
If you are referring to Mexicans not being in college or being people who do everyone else's work then this is a little prejudice. This comment has the potential to be hurtful to anyone who may identify as Mexican. May be good to reflect on this comment for future word choice.