This is an important point. Increasingly, those who are justifiably cautious regarding seasonal flu shots are getting labelled as "anti-vaxxers". Rather than brow-beating those people into submission, what it does is make them think that the anti-vaxxers might actually have a point. Inevitably, it has the opposite effect public health authorities were looking for. You can't put extreme labels on people who have legitimate concerns, because all it does is make them wonder who else you're doing that to.