Yeah I know people who are 100% adamant that they will not get the flu shot or any other shot and yet, they were brought up long long before the age of social media and alternate news and influencers coming up with all these cockamami ideas that vaccines are part of a secret government mind control (or some other baloney)...
These are people who are well into their adult years, otherwise considered to be intelligent and well informed and well read, who simply will not get the flu shot or, after they've had two or three of them back in the day, any more covid shots.
"I've had enough of this! They can't make me! When we were kids we didn't get shots for every last thing (not true, but it was so long ago I'm sure they've forgotten), You go out there, you get sick, it's not a big deal! Why does everybody have to make such a big deal out of everything!?!?" (Is what they say, not what I say)
I say that public health which includes the development of and distribution of effective vaccines does a great job of lowering the instances and severity of illness within the population. No it's not 100% protection. Nothing is 100% protection. Yes there is the argument that the vaccination you get today may not protect you from the flu strain you come in contact with.
Aside from that... Basically people who use the argument that since "it is not 100,000% effective, it's not good enough for them so, why bother" ... Fine. Go out there live your life. The problem is, if they get sick, they're going to bring it back to your household. So, you do what you can to protect yourself, which includes getting your vaccinations, getting your children vaccinated, and then practicing good hygiene like washing your hands and keeping your hands away from your face and your eyes and your nose and your mouth, stay well hydrated, try to get the proper amount of sleep so you're not exhausted, eat well, when you're in a public place such as a grocery store or shopping mall or a doctor's office, put on a mask. If there's some kind of social engagement or party that'll be quite well attended especially in a small place, consider not going.
That's all you can do to try to stay away from illness during the winter time. Trouble is if you have school age kids, they're going to bring something home from school eventually, and if you have a husband that works in a school, same deal. All you can do is try to minimize the exposure and try to maximize your protection. Aside from that, there's not much you can do. Really. Worrying about it just makes your immune system lower.