You misunderstand.  I do not say that I believe that teaching is a blue collar profession. I said: 
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"The picture accompanying this article graphically illustrates the problem with American educational locally and nationally. The teacher's unions are utilizing blue collar tactics to achieve their ends in what once was a white collar profession."
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Perception is reality.  Educators who act out and perpetually parade around in T-shirts with crudely lettered placards are poor role models and one reason why young people are not entering the profession. 
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Educators who cannot abide the local environment are free to take positions on the mainland or change careers.  The biggest detriments to improving local education positions is the immobility of labor and the HSTA,not necessarily in that order.