I’ve actually met people that claim they can’t tell if something is CGI. And there are people who defend the Prequels saying they can’t tell that the Clonetroopers are CGI.
When I was a young kid, I often couldn’t tell CGI and practical effects apart. There’re times I’ll revisit a movie/TV show I haven’t seen in decades and see obvious CG in play, then find myself flabbergasted that I was ever taken in by the effect. In the case of the prequels, I knew most of what I was seeing was clearly CGI, though I failed to realize all the clonetroopers in AOTC were digital.