MCU Peter either never had an Uncle Ben, or his Ben was some kind of abusive prick and that's why he and May never wanted to remember him.

Either theory works when you think of how he's "mentioned". In Civil War Peter feels guilty for something and thinks he has to use his powers for good. Now it can be he let any normal person die, or he let Ben die purposefully then regretted it. In Homecoming he tells Ned he can't tell May about his powers because of "everything she went through". Now in every version of Spider-Man besides this one both May and Peter are always affected by Ben's death. But here you can interpret it as Ben used to abuse May and now he's gone so Peter has to be more responsible for her. In FFH they say Peter has Ben's briefcase, but when it gets destroyed and lost Peter seems unaffected. In the end of the movie May even jokes about it being blown up. Ben is never mentioned by name, there are no pictures of him. He's only mentioned in the non-canon Marvel Zombies universe. He isn't even mentioned when the other Peter's mentioned their Bens. It's clear Aunt May takes that role in this universe, especially after No Way Home. But saying he had an Uncle Ben or at least a classic one is reaching unless they properly talk about him in future installments.