“the glorification of indulgence is not a Torah value”
The real question, and appropriate discussion is, was this dinner a glorification of indulgence. The next question is, if you believe it is, is this the proper forum to give tochacha (or a mussar shmooze) to those who attended. Finally, is it necessary or even appropriate to use terms such as MO when offering that tochacha (or mussar schmooze).