There is no cocktail service for BKK (or SGN, MNL etc) due to the 'short flying time'. On request only.

Recently on an NRT-HKG that was blocked at over 5 hours, they told me cocktail/nuts were 'on request' too. I guess next time they can say everything is on request and enjoy their chit chat session in the galley for the entire flight.
With the manpower shortage CX is just not in any position to empower (let alone discipline.... to some extent their jobs are now safer than AA/UA FAs) the crew to deliver any sort of service whatsoever. Perhaps save for the very few remaining 'lifers' around.

The cabin crew are proudly aware that they are here for our safety. We should be grateful they're feeding us!!!! /s