I think Ravi is looking at the entire episode from a totally negative point of view...He feels that he is (or was) untouchable and his wife is a christian, on their entry to the temple, the thanthri's conducted purification of the temple... It is wrong to state that the temple management came to know about the religion of Ravi's wife after the feeding ceremony....Ravi himself mentioned that he is in public life for the last 50 years, in that case, certain most of the people would know that his wife is a christian (including the temple management). Even after knowing that, since he is a hindu believer, the temple allowed him to conduct the feeding ceremony of his grandson (even his son's marriage). Having fullfilled his wish and faith, if the temple has followed the consequent rituals (being followed for decades), what is wrong in that. If the temple management and or thanthri's were arrogant ( 'brahminical arrogance' as per Ravi), then they would not have even allowed Ravi's grand son's feeding ceremony inside the temple (and earlier his son's marriage)...
Many a temples, not only in Kerala, several parts of the country, follows certain traditions, faiths, rituals and certain procedures for immemorial years and challenging or stopping these activities would adversely effect the faith and believes of the devotees.
A pure devotee should not bother about how the temple conducts and its procedures, but, to abide by the rules set by every temples for that matte
