text: Rick: It's a problem for the same reason why these other civil rights issues are a problem.
  
  Suppose a black guy sees an ad in the paper to rent a room in someone's house.  He goes there but gets turned away because he's black.  In your words: What's the problem?  Why can't he just go to a different place to rent a room?
  
  Suppose a woman finds out she's pregnant and goes to a hospital for an abortion, but they won't do it for her because it's a Catholic hospital and its religion says abortion is a sin.  In your words: What's the problem?  Why can't she just go to a different hospital?
  
  Suppose a bakery makes wedding cakes, and a homosexual wants a cake decorated to show two men getting married?  The baker refuses, saying homosexual marriage is against his religion.  In your words: What's the problem?  Why can't he just go to a different bakery?  
  
  All 3 examples have really happened and resulted in lawsuits.  I'll bet you have no problem understanding what's the problem in those cases.