Putting up a Pac 12 South Banner and making some jokes on CB and Twitter is in the realm of "good-natured ribbing and fun" ... it doesn't cross any lines and that's the fun of being a fan...we get to rub it in that elitist conferences face this year, and they've got to rub it in our lonely independent faces the year(S) before. Utah will get a chance to do something about it........in like 3 years (LOL!) but....they'll get a chance and eventually some day, they'll get to return the favor.
However, with taht said — when fans start using blatantly hurtful, hateful, ignorant, bigoted, angry, and other sorts of negative expressions/speech to attack something or some group of people, thats when it goes into the out of bounds territories and I believe it crosses the line. That's why its so funny, because there's nothing out of bounds about taking credit for going undefeated in P12 play especially when we basically played their top teams and filled out half our schedule with their conference....and by simply stating the obvious and enjoying the irony and humor of it all...it makes them "lash out irrationally"....
That's just funny.