Interesting - the Tennessee message board is much nastier than most Tennessee fans are in person.
As to UConn fans (from an RU fan's POV) - most are quite civil in person and on the board - no reason for a UConn fan to root for RU or Tennessee. However, the ones that aren't - just a very few on the board, and a few in person - were as nasty as I have ever seen. My favorite - unknown - UConn fan was the one who came up to my wife and apologized for the behavior of a middle aged UConn fan that was taunting and making obscene gestures at the RU seating area of the Greensboro regional after you beat us fair and square.
And my least favorite were the group in Cleveland - at the F4, that taunted a group of RU fans on the street and wouldn't let them walk past on the sidewalk. The RU fans? - the president of the fan club (a minister, FWIW) and an 80+ year old, nicest gentleman you could meet, that could barely walk as he was dying of cancer in his back among the group. Forced into the street (we were on the opposite side).
My point - not aimed at UConn - is that every fan base has jerks. I heard one story about a Rutgers fan that pissed me off to the max. In Tennessee's case, perhaps they are mostly on their board.