The First Amendment is a limitation on the government. It is not a limitation on citizens.
My neighbor is gay, he invites me to his wedding. I tell him to **** off and eat rat poison. There is nothing he can do about it but get pissed off.
Two lesbians come into my shop demanding an oil painting. I tell them to get the **** out. Judge says they are tresspassers.
People in courtrooms tell others to **** off on a daily basis.
Courtesy is not legislated. You think it should be legislated as to degenerates and perverts.
Make them the cake, then scream bible verses at them. Tough shit they got their cake.
Rights are generally limitations on governments. Hence a right is something you can do that the govt isn't allowed to say you can't do.
Now, if you tell someone to "**** off" the govt may, or may not, decide that what you have done is illegal. Now, if it's protected by a right, then the govt shouldn't tell you that you can't do this.
But then again it depends, because not all speech is protected. So it it's not protected then the govt can make a law that means you'll be breaking it if you do it.
Back to the bakers. They signed a deal with the government. This deal said what they can't do. One thing they can't do is discriminate against people.
RCW 49.60.030: Freedom from discrimination—Declaration of civil rights.
This is Washington state's freedom from discrimination law.
"(1) The right to be free from discrimination because of race, creed, color, national origin, sex, honorably discharged veteran or military status, sexual orientation, or the presence of any sensory, mental, or physical disability or the use of a trained dog guide or service animal by a person with a disability is recognized as and declared to be a civil right. This right shall include, but not be limited to:"
"(f) The right to engage in commerce free from any discriminatory boycotts or blacklists. Discriminatory boycotts or blacklists for purposes of this section shall be defined as the formation or execution of any express or implied agreement, understanding, policy or contractual arrangement for economic benefit between any persons which is not specifically authorized by the laws of the United States and which is required or imposed, either directly or indirectly, overtly or covertly, by a foreign government or foreign person in order to restrict, condition, prohibit, or interfere with or in order to exclude any person or persons from any business relationship on the basis of race, color, creed, religion, sex, honorably discharged veteran or military status, sexual orientation, the presence of any sensory, mental, or physical disability, or the use of a trained dog guide or service animal by a person with a disability, or national origin or lawful business relationship: PROVIDED HOWEVER, That nothing herein contained shall prohibit the use of boycotts as authorized by law pertaining to labor disputes and unfair labor practices; and"
If you can't cope with this law, don't open a business in Washington state, simple as.