You might want to remove "frat" from your vocabulary and replace it with "fraternity" to avoid a faux pas.
For NPHC orgs, which he implied that he is interested in, it is not considered a faux pas to refer to a fraternity as a 'frat'. As a matter of fact, they (the guys in NPHC frats) call each other frat. 'Frat' is not seen as an offensive term for NPHC orgs.
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