Tell him to call off his dogs. If they don't follow his lead, then that's another story. But right now, they're all following the lead of their Leader.
You don't see Fr. Zendejas, Bishop Williamson,
or any other Resistance priests hated by Fr. Pfeiffer's followers wasting their time (and ammunition) by firing at fellow Resistance supporters.
But the same can't be said for Fr. Pfeiffer's followers. They are the guilty party. They are 100% responsible for any "strife" or "infighting" you or others might observe in the Resistance. You know, the Recusant, Frs. Pfeiffer and Hewko, Maccabees, and the two small fora (of a couple hundred members total) which rabidly support Fr. Pfeiffer (and hate his enemies -- which is everyone who won't follow Fr. Pfeiffer!)
I hope everyone is looking at this deeply, and "judging just judgments" about this. (cf.
John 7:24"Judge not according to the appearance, but judge just judgment.") Just because you see two people on the street, with the fist of one of them striking the cheek of the other, doesn't mean that "two people are engaging in fighting." It could be an attacker and a victim; they could be shooting a movie, etc.
Let's not fall for the superficial appearances, but rather let us cut to the heart of the matter, and identify the REAL guilty party.