Yeah, there are inconsistencies all over these films. Nothing was really planned 100% with the prequels or an effort to make it exactly in continuity. Loose prequel I guess or preboot is what to take it as. That line goes with how it should be between the two though. Prof X wants him to see his views on a world with Humans and Mutants. That always needs to be there. He always has some hope that he will listen. As a first introduction on film to those characters I thought they nailed it.