Anyone who makes a big whoop de doo about refusing to bake a cake as freedom of speech, whether the cake is pro- or anti-gay, is a dolt.
The fact that some anti-gay types want to force a gay baker to bake a cake with an anti-gay message is just as dumb as the reverse situation.
No one changes anything by writing slogans on cake with icing.
This is as almost as trivial as writing "WASH ME" in the dust on a dirty car. I imagine someone would like to sue over that as well.
The car should be washed, and writing this is free speech.
But the car is private property, and no on has the right to write anything in MY dust on MY car.