I once was faced with a very large client terminating our contract by asking for proof that my employees/myself were vaccinated. I said "No. Because none of us are."

They said "You need to be vaccinated or else we have to terminate the contract."

My formal response, in writing, was "Go fuck yourself."

I called their bluff, they tried to bring the work in-house, they failed miserably and came crawling back... begging for us to continue working with them.

Hold the line. Fuck these stupid sheep.