Most people with views labeled "anti-science" are very much believers in science in the abstract, they just believe that the commonly accepted science is perverted by ideological biases, political agendas and/or corporate corruption.
It's a form of anti-intellectualism: the belief that those who society considers the experts can't be trusted.
So are scientists that push against the intellectual orthodoxy by default anti-intellectual? You know there are disagreements within the natural sciences, correct?