Oh good, I mention not getting a single transphobic comment since I came out and, as if summoned, one appears
Yes. Seriously.
It is transphobic to imply that “chicks” is a category that does not include “dicks.”
What you intended is irrelevant, because intent is always irrelevant. (And, frankly, because if your intent were good you’d be apologizing, not minimizing.)
And, frankly, cis people don’t get to decide what’s transphobic any more than men get to decide what’s sexist or white people get to decide what’s racist.