This is what some people said to me when I said that Batman and Superman would become friends upon Batman learning that their mother's shared the same name or that Leto was barely in Suicide Squad.
But yeah,
Stark ****s up Keaton's company/business by trying to be the attention, glory seeking, narcisstic **** he is (as if Stark doesn't have enough better things to do and didn't learn his lesson after Age of Ultron and Civil War). A ton of blue collar workers get laid off and Keaton is pissed.
I like that from a story standpoint. It really makes Toomes stand out. They weren't jerking around when they said they were gonna reinvent him him. Couple that with Keaton's charisma, and we might just get another good MCU villain.