"Concern Troll" is one of the most bullshit terms reddit every shit out.

It's the right wing equivalent of calling something "hate speech". It allows dismissing someone's position without actually countering it.

EDIT: To further expand on my point. I strongly support Trump. That does not mean I buy into the endless string of conspiracy lunacy and glassy eyed blind devotion that happens here. If there were another Trump supporter site I would likely go there.