The point of the suit was not just about free speech. Emotional distress counts for something in our justice system.
I am pretty sure that "emotional distress" is not mentioned anywhere in the Constitution. Free speech is clearly mentioned, and preaching that you believe what the Bible quite clearly says also involves freedom of religion, even if it suggests that the USA should rightfully be destroyed by God for allowing gays to openly express their gaiety.
I don't agree with anything that these lameoids preach. I don't think that any just God would punish entire societies for the supposed transgressions of a minority, or of the majority for allowing the minority to transgress. I have zero proof that God disapproves of homosexuality. I have seen male dogs humping one another, and firmly believe that any onmiscient diety would be able to design male dogs that would not hump one another.
Nor do I believe that the Bible is the word of God. Much of it is far too silly and bigoted for this to be the case.
On the other hand, the Constitution says what it says, and like it or not, it is the law of the land.
How do I prove that I am emotionally distressed, anyway? I suggest that proving such a subjective thing as emotional distress is damn near impossible: one mourner at a funeral might see the Rev. Dingbat with his sign and be deeply offended, while another would just shrug it off as a typical act of fanatical religious idiocy. Both could claim emotional distress, or neither might claim it, but the fact is that the degree of emotional distress is unknowable and unproveable.
Should we set up a scale of emotional distress, where 10 is seeing your baby being flattened by a very slow bulldozer, and a 1 is a small zit on your nose on Prom Night? I mean, how do you measure anything as subjective as emotional distress, other than when said distress causes a person to totally lose it and kill the bulldozer owner or shatter the bathroom mirror?