The art you posted is like the first example. See, someone even made a blog all about it, they enjoy picking that stuff apart. Repetitive AI art created by typing out four words or pasting a Facebook post into the prompt text box is the second. People don't even entertain themselves by looking at how bad it is, they just plain hate it.

Yes, by observing the quality of the output and means of production. If it's the standard "AI house style" one gets when prompting image models, by which I am immediately and viscerally repelled, then I am confident assuming it's a low effort "typed in a prompt, got a thing, called it a day" result, rather than actually applying some taste and judgement and trying a bunch of different things in different styles and adjusting things until it's something nice.