It seems to me that you have an unrealistic expectation of what any large employer, in Europe at any rate, would say in such a situation. Would you expect AF to reply with a diatribe excoriating the behaviour of the lounger manager? Of course, they would not; nor would any lounge operator in a similar situation do. They will have received the OP's complaint and they might have asked the lounge manager for his version of events. I dare say that what the lounge manager will have said will not have been phrased in the same terms as in the OP's complaint. Based on that, they acknowledge that the OP is unhappy, apologise and offer compensation. That is pretty much textbook customer relations stuff. Even if they were minded to take any form of action/sanction against the member of staff concerned, it would be highly improper to discuss that with the OP.

As to the level of compensation and the comparison with BA, frankly compensation with BA is all over the place and more akin to a lottery than anything else. They will send you a shedload of miles for a dysfunctional IFE and yet deny you any compensation for removing the free middle seat in Club Europe. There is also a huge variation between what BA gives in compensation to regular travelers (BAEC gold and above, in particular) and non-elite occasional travelers. The former tend to be compensated rather generously on the whole whereas the latter are usually given peanuts. I would therefore not evaluate the reasonableness of compensation based on BA practice.