I don't feel so bad now about having dropped to SG!
I'm probably just going to just echo mostly what has already been said.
The response/reason the OP was offered is nonsensical, but would appear to confirm that the 'policy' and behaviour of MEL F lounge staff was 'official' and not just an aberration otherwise they would likely have apologised and not offered up such offensive (offensive because they are asking people to believe it) claptrap in response to the OP's observation.
While I guess Sofitel are trying to cut costs, I doubt they are trying to drive customers away in order to do it - their foot may well up with lead poisoning if they were.
Equally offensive is the embarrassment caused to and mentioned by
Ansett for him and family when the employee advised them in a manner that alerted surrounding pax that they (
Ansett et al) were being 'cut off' - in fact this would piss me off even more than the inane reason subsequently given by customer care. But of course, if you show how pissed off you are at the time, it's a no-win, as they can cite 'aggressive attitude' (no matter how politely you do it), and thus (perhaps just a little bit triumphantly) prove their point.