... I'm torn about this. On one hand it's stupid to write a message like that on a cake in the first place. But as Christian bakeries shouldn't be allowed to discriminate upon gay couples, should other bakeries have a say what goes on their cakes (i.e. political statements, etc)? I really don't know.
But you could also take something like this to an extreme and ask a bakery to do a Nazi sign or something. So I mean bakeries should have some say. It's an interest debate nonetheless.
EDIT: Just watched the video and I hope she gets her coins from him for that recorded phone call and damages to her business.