C.S. Lewis agrees with me (see previous post):
The word gentleman originally meant something recognisable; one who had a coat of arms and some landed property. When you called someone “a gentleman” you were not paying him a compliment, but merely stating a fact. If you said he was not “a gentleman” you were not insulting him, but giving information. There was no contradiction in saying that John was a liar and a gentleman; any more than there now is in saying that James is a fool and an M.A. But then there came people who said – so rightly, charitably, spiritually, sensitively, so anything but usefully – “Ah but surely the important thing about a gentleman is not the coat of arms and the land, but the behaviour? Surely he is the true gentleman who behaves as a gentleman should? Surely in that sense Edward is far more truly a gentleman than John?” They meant well. To be honourable and courteous and brave is of course a far better thing than to have a coat of arms. But it is not the same thing. Worse still, it is not a thing everyone will agree about. To call a man “a gentleman” in this new, refined sense, becomes, in fact, not a way of giving information about him, but a way of praising him: to deny that he is “a gentleman” becomes simply a way of insulting him. When a word ceases to be a term of description and becomes merely a term of praise, it no longer tells you facts about the object: it only tells you about the speaker’s attitude to that object. (A ‘nice’ meal only means a meal the speaker likes.) A gentleman, once it has been spiritualised and refined out of its old coarse, objective sense, means hardly more than a man whom the speaker likes. As a result, gentleman is now a useless word. We had lots of terms of approval already, so it was not needed for that use; on the other hand if anyone (say, in a historical work) wants to use it in its old sense, he cannot do so without explanations. It has been spoiled for that purpose.