My two cents:
He’s using children’s class time to make a point. I sympathize, but he should have found a different way and I wouldn’t want my kid in his class. There should be no other agenda in class than learning. Anything that distracts from that is selfish.
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You are right. He is indeed doing that, as are the transsexuals who’ve been given promotions and raises in his high school ahead of him, simply on the basis of their sexual identity. I find their presence in the schools, their influence over impressionable teenagers, and the edge they have for advancement much more offensive than a man wearing an impudent costume to make a point he’s been unable to make in the customary, polite ways. It’s one small act against the extremely offensive transsexual narrative being forced on our emotionally vulnerable high school students.
Obviously, we agree on this. IMHO, he could have found another way to make the same point... a point that needs to be made.