Besides, it's not like a death in the family gets brought up THAT often. "Hey, remember when your Uncle Ben got shot?"
well, I suppose you've not heard of Uncle Ben's teaching of "With great power comes great responsibility". It's okay, it was never important enough in the comics to warrant its inclusion in Homecoming. It was just me who thought it was. Nobody else cares enough.
...pretty sure it was shown rather than told. Bare minimum, it's been implied.
Look, they didn't need to show us Uncle Ben dying again. We know that backstory. Everyone knows that backstory. We had pretty much the same logic going when they never showed Thomas and Martha Wayne getting shot in BtAS - why bother wasting time telling us something that we already know?