Can you tell us which shul it is? I want a good herring and cholent!
Seriously, though, I wouldn’t daven there either. There are really two points to be made here; one about gluttony and chinuch, as you said, but the other about selecting a shul/kehillah.
A chevrah which wants a kiddush club will choose a shul with a Rav who let’s it go, and if they’re the ones choosing the Rav, it’s even easier.
Yes, of course the Rav is wrong as well, but face it, if he would put his foot down, they’ll either choose another Rav or another shul. We don’t live in the shtetl any longer.