We agree here that talking in shul is improper and should not take place. Indeed , the fellow who profanely (?) orders someone out of the “party shul” is high on the arrogant scale. Only somewhat lower on this scale are the judges here who have determined that these congregants are ovdei avodah zarah and have no desire to serve Hashem. Let Hashem make his own judgement.
I am in favor of writing to the Rabbi, and you need not daven there anymore.