I don't understand how they say he's impolite, rude and not understandable, not having met him?

Was there a reason during Christmas break, to not introduce him, if even as a friend from school?

Your parents aren't trusting of something about him.
Why'd you mention moving in together, before you even finish school and get settled with your career? Where will he work, in the states or does he need to return home?

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