Got no problems with flu shots. They're absolutely a worthwhile gamble. I've read some absurd conspiracy theories why they're pushed so hard these days. Some people don't understand science and think their experience is the be-all tell for everyone else.
WASH YOUR HANDS folks. Before anything gets close to your mouth, wash yer darn hands (and go watch a video how to do it while yer at it). We can't avoid all sickness, but I bet an awful lot of bugs could be avoided with some hand washing. I'm sort of amazed with our immune systems. I know plenty of people who only wash their hands when they take showers, and when they do bother, they wash them for all of 12 seconds. "I'm not stupid. I know how to wash my hands. I'm 70 years old." "I don't know if you're stupid or not, but I do know you have no idea how to wash your hands."
Oh, and sneeze into your elbow, not into your hand. You aren't going to subsequently touch every public thing in the house with your elbow.