MN may have 5 D1 teams, but Mich and Mass both have more. Mich has 7 (LSSU, MTU, NMU, UM, MSU, FSU, CMU, WMU), and I think Mass has 7 as well, but can't name 'em all (BU, BC, Harvard, UMass, UMass-Lowell, Holy Cross, ? [too lazy to look])
I believe Michigan (as a state, not just UM) also holds the most D1 titles, although can't confirm it, and I'm not going to look that up either.
Your MN "buddy" is about as dumb as it gets and shows Minnesota's true colors. He(?) doesn't even have to be a Gophers fan, it's just a general MN-born sports fan.