Yes, it's completely rational to immediately respond to a statement with sarcasm and disdain without actually hearing the reasoning behind it.
I don't need the vaccine. Nobody that I have been around since the panic started has been diagnosed with coronavirus, and I haven't been around people very much anyway.
Also, things are expected to start opening up pretty soon. People who are staying indoors and over-sanitizing might still be getting pretty sick when this is over.
The immune system gets practice fighting off dangerous diseases, bacteria, etc. by battling things that aren't especially dangerous. I don't think vaccination is a bad thing: many vaccines are very good, like for polio. But I do believe certain vaccines will do more harm than good by not letting your body strengthen itself against sickness.
In summary, there's practically no chance I have COVID-19, it's not dangerous to the people I am normally around, and the vaccine probably won't benefit me. I think it's fairly logical to conclude I should not get the vaccine for coronavirus if it comes out.