I see what you're getting at and in general agree. However, we've definitely seen anecdotes where the mere act of ringing the call button appears to deeply offend certain FAs, in which case it might not be possible to get back on their good side (not to mention needing to "get back on their good side" is uncalled for in the first place).

If your method works on bartenders, though, let me know if you're in SF sometime. We've got the world champs for grumpy "service" out here, so I'm curious how you'd do