Choosing to permanently boycott a business that is doing what it thinks is best for the owners, employees and patrons during this unprecedented time seems unnecessarily harsh. I don't believe you are, but to an outsider you appear to be taking it personally.
From the CDC.
Benefits of Getting a COVID-19 Vaccine | CDC
COVID-19 vaccines are effective
COVID 19-vaccines are effective.
They can keep you from getting and spreading the virus that causes COVID-19. Learn more about the different COVID-19 vaccines.
COVID-19 vaccines also help keep you from getting seriously ill even if you do get COVID-19.
Getting vaccinated yourself
may also protect people around you, particularly people at increased risk for severe illness from COVID-19.
I agree that it primarily protects the individual, but per the CDC it does help in preventing the spread. If folks choose not to get it to protect themselves and others, which is their choice, then they must know that there are repercussions to their inaction. The unfortunate part that I'm seeing is when mandates were lifted and the unvaccinated were asked to still wear their masks, they mostly did not listen. It's a selfish move and I think is the primary reason for the upticks everywhere. I'm fully vaccinated, but given the upticks and my distrust of the unvaccinated to wear their masks, I've taken to wearing my mask again when I'm indoors at places like Stop & Shop. If it's a quick in and out I don't wear it (post office, gast station, etc.).