If there is a Reverse Flash that is a toxic stan for Barry is probably Hunter Zolomon after Flash Wars .
As for Barry, i don't hate him, i don't really hate fictional characthers, is a waste of time for me. I strongly dislike how DC editorial handled his return and pretty much made every possible effort to destroy Wally in order to prop Barry.
Some people migth compare this to what it was to Barry after Crisis, but is not even close, Barry was put on a pedestal after his death and declared a saint, Wally lost everything and almost died because of Barry actions. Now, i'm not gonna say that what happened Post-Crisis wise was perfect for Barry fans, after all, his fans would rather have monthly adventures with their favorite characther than seeing him ocasionally in flashback tales, besides the fact than the last years of Barry weren't great quality wise, i can understand their sadness of not having him anymore, but after this last 10 years of his return and the way that DC handled it, had made almost incapable of caring to whatever happens to Barry, this is on you DC, live with it.
So in essence, i put the blame more on DC than Barry at the end, but sadly it still affected my enjoyment of him to an extent, doesn't that Willianson's take lasted way too long.