I never fully understood the hate JJ has for Spidey. So I did a bit of research, and came up with my own interp.
He initially hides his true feelings by thinking there are no hero's in the world and they are only out to make themselves feel better for whatever purpose. JJ has no intention of worshipping a masked criminal.
Then
JJ explains to Robbie that he was once married over 30 years ago. On the day of the wedding, JJ was shot in a drive-by and his wife was abducted...all by 1 man wearing a balaclava. With a bit of journalism,he tracked the kidnapper down. He only turned out to be the leading Detective in the case,he set up the crime to look the hero,as he felt unappreciated. The Detective killed JJ's wife,then himself.
Thats why JJ believes Spider-Man cant be trusted,and will one day be exposed as the criminal he is.