Wiktionary
go against the grain
vb. (context idiomatic English) To defy convention; to do something in a manner that is unusual or out of the ordinary.
Usage examples of "go against the grain".
Yet Llewelyn acknowledges his known bastard proudly, it would go against the grain with him to hide this one.
But there seemed to be a built-in perversity in the makeup of intelligent creatures, whether natural or supernatural, that made them go against the grain, against what was best for them, against all the things they should believe.
I had no reason to go against the grain of public belief, the common holding that gods and power are mythologies.