Across the three MCU "Spider-Man" films, Flash Thompson's parents are presented as mostly absent from his life. In "Spider-Man: Homecoming," Flash hosts a party without concern that they'll be around to catch him. And in a particularly heartbreaking moment toward the end of "Spider-Man: Far From Home," he returns from a pretty dangerous European school trip with his class to find that his father has sent a chauffeur to the airport rather than pick him up personally.
According to Tony Revolori, that detail was his own idea, as he explained to The Hollywood Reporter. "Flash's driver, Gerald, was actually supposed to play Flash's father," he told the publication, "but the day before, I was having a drink with one of the producers, Chris Buongiorno, and I think I said to him, 'What if his parents, after all of this, still don't show up?'"
In fact, Revolori says they explored both options, but ultimately went with his idea because it played better onscreen. " ... we shot both versions with that actor as Flash's father and Flash's driver. So the driver version ended up being the funny one, and that's the one they ended up using." Though ultimately a small detail, that brief moment provides an elucidation of why Flash might choose to bully Peter Parker, whose caring Aunt May (Marisa Tomei) fills an emotional role in the latter kid's life — a role that Flash never had anyone play for him.