>>97739858They mentioned in interviews that they wanted Flash Thompson to be Peters equal mentally. While also representing how different they are due to different upbringings.
Because his jock-type bullying didn't fit the character changes, his style of bullying was based on social media harassment. Name calling, showing the other person up, etc.
Personally, I think they would have been better using Harry Osborn. He already has the intelligence and upbringing they were looking for.