And why would anyone be surprised by this.  Teachers unions are controlled by far far left.   They were hijacked years ago from an unattentive and disinterested membership.
Many teachers are, and should be, thoughly embarrassed by their unions.  Unfortunately, his type of stupidity reflects on all teachers and results in the generally low esteem held for them by many us.   And these teachers want us to view them as professionals? Remember the day when they presented themselves as such?  Well I think that education is far to important to be left in the hands of monopolistic organizations such as the BCTF and its ilk.