It's not Scorsese that sought attention. It's the interviewers. These comments, as well as the Tarantino ones, and pretty much all comments from filmmakers of this kind, were made as answers to questions in longer interviews. Why does Scorsese's opinion on superhero movies even matter? He makes completely different movies to what Marvel and DC put out. Because you can generate clicks with it, you can fill a news cycle with it and reactions to it.
All because some people feel so insecure in their own opinions that they feel personally attacked when someone disagrees with them. Seriously, go ahead, disagree with the man, but to go on about it three years after Scorsese actually made the comments, come on. Get over it, already.