. . come out against the law - they fear broad retaliation for the acts of a very few businesses.

A civil right to buy flowers? If you allow being denied for being gay, you must logically allow denial for Blacks, Mexicans, Asians, Inuit, Indians and persons from Blue States, etc. etc - and, if you allow this for flowers, you must logically allow it for all other businesses as well. Welcome to 1895.