I have heard the Dimonds ridicule and condemn laity who monetarily support groups such as the SSPX, SSPV, CMRI, et al who preach or impose heresy. They base this on, I believe, a decree of Innocent III who condemned the support of heretics. I may be wrong on that.
Setting aside whether you "like" the Dimonds or not, or whether they those aforementioned groups are in fact "heretical", is the premise of financial support unsubstantiated? Are they right in theory?