A bit of history on that one: During the 2008 OU/OSU game, the 110 wanted to find a way to mock the OSU fans in their own stadium, and that chant was born during OSU's "O-H-I-O" chant that they pass around the stadium to the four different sections. A couple of us in the 110 decided to add our own "U!" to the chant after the last "O!", and it caught on until the whole OU section was doing it the rest of the game, and then again in 2010 when we went. So, I suppose apologies are in order to those of you who hate the U.
But hey, it was born out of ignorance anyway? Bonus points for that?!
Your history is incorrect. A member of this board added the U to A&M's O-H-I-O chant. We were seated in 2 sections clockwise from the 110 about 7-10 rows off the field. One of our group was a former OHIO cheerleader. In short, my friend did it, then our group of 4 did it and the people sitting around us did it, then the then the cheerleaders picked it up and it spread to the band and the upper-deck OHIO contingent, as well as the smattering of people around the stadium.
While I agree in general that we shouldn't refer to our selves as Ohio U, it served 2 important purposes on that day: (1) it royally pissed off the A&Mers, (2) it seriously cut into their use of that chant for much of that game (until they came back to take the lead in the 4th quarter). I don't apologize for my role in propagating it, and I doubt that the inventor of the U apologizes either.