The slogan the bakers objected to was an expression of protest against the same bigotry that was displayed by them by refusing to supply it.

No it was not.
They support the existing law.
That does not make anyone a bigot Jim.
More than a third of the poulation of Ireland agree with them.
Polls show that 70% in the North support the Bakers.

Well, if that ever happens, let's see, eh?

Let's see what Steve?
There is nothing to stop "activists" making an issue by putting the same request to Muslim businesses.
How many Muslim families are you prepared to see dragged to court like this Christian family?
That is equality for you Steve.