Even congregation prayers can be a vehicle for "sermonizing," calling attention to trends, asking Jehovah to adjust the thinking of mislead ones.
Unwarranted "digs" can be found in any talk, prayer, comment or experience given at the Kingdom Hall.
Its a subtle technique learned from reading the Watchtower, where counsel can be subtle and implied, not straight-forward.
It would be funny to see a perpetrator get called out at the Kingdom Hall: "What are you implying Bro. Forktongue? Are you trying to say I'm materialistic?"
tms