But I've yet to see something wwrthwhile.

So, you don't like the art you've seen made with AI. That's fine. Art is subjective; just because you don't like a medium doesn't mean it's not creative. There are plenty of mediums and styles I don't personally like either.

If you think that AI is a shortcut to replace a creative idea, you will not be able to get any art from it.

That's not contentious, in the sense of you won't come up with any interesting art. My toddler's scribble on a page isn't interesting art either, but it's still art.

As for the 'AI bro' thing - I haven't run in to this, but yes it does sound like the ones that don't want to share their prompts are insecure. It's very normal for most artists to share their media and techniques with their piece; most AI art I've seen, particularly the better more interesting stuff, the person has shared their prompts and the models they've used.p