OP is full of shit.
Example: the 2015 law council president was Sush Rajeevan, definitely not white. Further, I know for a fact that 2014 and 2013 law council had minority students.
Further, there are more "[diversity] law students" groups than you shake a deciduous forest at. If the OP hasn't made any friends, despite many attempts with a wide variety of people, maybe look at the common factor.
I am not a fan of UMN Law, for unrelated reasons. I went there, and am extremely unlikely to ever donate money. However, the incredibly diverse student body (Especially compared to the state demographic as a whole) is very inclusive. Among my lasting friends are: Armenian, Korean, Lithuanian, Native Minnesotan, Native American, Mexican, Indian, and even a Packer fan! And I wasn't particularly social, what with being married with multiple children all through law school (and today, thanks for asking)
So, tl:dr law school is what you make it, and OP apparently struggles to make friends/ might be very unlikeable.