The overarching reason of why people get upset about others not having the vaccine is

a) Vaccines are more effective when more people take it, it helps to limit spread so less likely for more vulnerable people to catch it

b) Their main purpose it to limit the severity of the symptoms and so means less likely to be hospitalised and using up resources that could be used on someone else

I understand the whole 'my body my choice' and would rather use education rather than forcing people to take it but when you look at the facts you are likely to be impacting others when not taking the vaccine, particularly someone who travels frequently and so could be seen as selfish.