The government says you can't smoke in public buildings, have to have vehicle insurance, can't physically harm someone else, can't have sex with someone without their consent, can't kill someone else, have to have your child in some kind of education, etc. etc. etc. Laws exist to force you to comply with societally mandated rules, ideally designed to protect us on both an individual and a societal level. By the other poster's definition, that's coercion.
No that's laws. People abide by those things because they are laws and there are reporting procedures when they don't.
Being unvaxxed is not against the law, so social punishment is coercion, isolating someone socially is an abuse tactic, othering them and creating an underclass.
We don't do this when someone breaks the law we report them to the police.
Making something into a strict rule in your own head and then sitting in judgement over those who don't follow said rule is being a power hungry cunt.
I cut controlling people from my dating life, I distance myself from controlling relatives and put them on strict information diets when it comes to my personal business.
Bullying someone over their vaccine status is no different to deciding how someone else should have voted, how they raise their own kids, whether they were right to break up with their ex or not, whether they drink more than you think they should.
We can all make decisions that we feel are in our own best interest, it's nothing in the world like saying you can't kill someone.