Congrats, you have very mainstream ethics. Imagine trying to run a business that uses no fossil fuels and does no business with anyone using fossil fuels.
I'm glad to hear that you can make it work. About how frequently do you cancel contracts because you've discovered your client is doing something unethical?
I recently declined a client who appears to be a white supremacist. I have declined work in the past due to the potential client organizations working with the military, police, or other violent organizations.
We all have this responsibility to place nonviolence above profit.
I think that's a very different thing than, as Chef is being asked to do here, terminating existing clients because they got some bad press on Twitter. Both in terms of your own operations (sudden cashflow interruptions are hard) and your clients' willingness to do business (can I justify the risk of waking up one Monday to learn that our CI provider is cutting me off and all development is dead in the water?)