Well, someone's brain is pretty limited. No, one can be a Christian and still not be a bigot, and the vast majority of Christians are not bigots. But you SHOULD be upset that bigots are using Christianity as their excuse, and tarnishing the faith in the process. Christ taught the very opposite of what these "Christians" are doing.
Romans 1:26-28 - 26 Because of this, God gave them over to shameful lusts. Even their women exchanged natural relations for unnatural ones. 27 In the same way the men also abandoned natural relations with women and were inflamed with lust for one another. Men committed indecent acts with other men, and received in themselves the due penalty for their perversion. 28 Furthermore, since they did not think it worthwhile to retain the knowledge of God, he gave them over to a depraved mind, to do what ought not to be done.