Let me put it in a simple way that he probably will not understand because he is a rabid extremist:

We are calling Regressive Leftists groomers because they are trying to radicalize children into a self-destructive ideology, and several of these extremist bastards are predators anyway, therefore it's ok to put them on the same level of people who trick/intimidate children for the purposes of sexual exploitation.

He will probably just screech "transphobe" and have his few remaining fans who happen to be regressive leftists mass report you if tell him this.