There is no slavery in the US.
Ok, maybe there is.
The thing to do is, simply put, a bad job.
Just do a bad job. You can very, VERY subtly hint that your heart may not be into it when you agree to take the job, but if they don’t take the hint, just give them a tape with way too much video of your legs and feet, muffled sound, etc.
Ya, intentionally do a bad job for them. Then word will spread in the homosexual community not to patronize that business.
Even though this whole area of “sexual orientation” and “sexual identity” is not a protected class under civil rights laws, the homosexuals behave as if it is. And, their allies in the media present their stories as alleged civil rights violations, when, under the law, these events are not civil rights violations.
If they know that you don’t want to be there the behavior they want you to tape would be even more outrageous than normal, just to make the person uncomfortable.