If, by some chance you need a very very good history lesson regarding why so many get uptight regarding that flag, I suggest speaking to Big Tex. He's our local history expert, and the son of a couple of freedom riders who has gone on to accomplish some pretty darn impressive things in his own life. Plus, he is a very nice guy. (Aka approachable and will take the time to talk with you)
If on the other hand, you want to know why everyone DOESN'T hate said flag, I will give you my best explanation of how the flag started as a symbol for a hard and valiantly fought, but ill advised military campaign, morphed into a major symbol of hate, and how it has now somehow started to morph again (starting in the late 70's) into now symbolizing independence, self governance, and just a laid back and easier way of life.
My suggestion though is to play the game, have a good time, and enjoy your friends. Reality is cold and hard and will have to be dealt with enough in life without dragging it into this game.