Something I Struggle to Understand

Many bigoted and repressive folks are also the ones who make sure to tell everyone that they are a "Good Christian" and to show off that they are a Christian as much as possible.  Jesus teaches us not to make a show of our religion, but to be humble unlike the hypocrites.  So why do these folks always seem to conveniently "forget" that teaching as they show off that they are a "Good Christian" but continue their oppressive ways?