I think it has to do with the fact that people realize that these days basically vaccinated people stand in direct conflict to the the anti-vaxxers. So, earlier

I think it has to do with the fact that people realize that these days basically vaccinated people stand in direct conflict to the the anti-vaxxers. So, earlier it appeared as if people could just do whatever they pleased (get a vaccination or not), but now everyone comes to the realization that this is not enough (at least not in the US and other countries, look at Denmark to see that it can be enough. But there over 80% of all over 12 year olds have been vaccinated. Thats miles ahead of e.g. US). This means that people who do not want to be vaccinated feel threatened in their choice because the public mood is at a tipping point (also because there are some vaccination orders coming for certain groups, e.g. military). Anti-vaxxers think their choice is theirs. But with rising hospitalization their choice means not just more deaths, but also tough choices for politicians and businesses in deciding how much they let people die instead of going into another lock-down. If more people were vaccinated this choice wouldn't have to be made. This is why vaccinated people are getting more irritated against anti-vaxxers. And also why anti-vaxxers are fighting for their choice and opinion.