To me the elitist part is that he's taking his personal dislike of Marvel movies and drawing a box around the things he does like as 'true cinema/movies.' That's the part that reeks of elitism saying 'this isn't good enough because I personally don't like it and think cinema should mean something.'

It's very similar to the art/high art/not art conversation that happened in the wider art world starting in the mid-20th and continuing somewhat today. The decision there has been very expansive.