Actually, I was just looking at the ECDPC (European Centre for Disease Prevention and Control) and they are telling people to get a flu shot.
Some people really do need to get the shots as they may have immunity conditions that cannot be controlled by sleep and eating. Please do not discourage those who wish to protect themselves to the extent they can.
As noted by many, flu is air-born and while washing your hands can help, it can't help with what's in the air you're breathing.
Now, saying all of that, I'm not really worried about it. I will or will not get the flu even with my precautions. It won't change where I go or what I do. (Unless it's obvious that there's a high incidence in the area.)