I don't believe that "voting with my wallet" is impractical. Taken to extremes, it does indeed cause polarization but I also think that it can cause real change in the world -- because it's capitalism, you know? Certainly the cost to me depends on how far I take it, but as I said in this case the hardship is minimal.
As a general rule, I don't make my personal views known at work or on social media. This comment thread is maybe the only time I have ever blurred that line. If someone were to find it and disagree so vehemently, then I suppose they are entitled to take the (legal) course of action they deem fit. I stand behind my words.
How did we get here? Someone expresses an opinion about stopping the killing of human beings is now labelled "evil".
Yes, in your (and my) opinion. And in his opinion, it's a necessary measure to protect innocent life. That makes him (probably) wrong, not evil.
Based on his statement, my response is that I do not want to conduct any sort of business with his company.
You are free to make those sorts of decisions, but it's an impractical way to go through life and it leads to the increased polarization of society. It's very likely that you have some political, moral, and/or religious views that your employers or customers would find deeply wrong and harmful. Should they cease doing business with you on that basis?