I've had that experience in STL a couple of times

A game against Green Bay years ago was a bad day, just horrible.

In town for Herdfest and Signman's epic tailgate. That was the high point of the day by a mile.

I was sitting next to a couple of guys in Packers gear. The stadium was seemingly 1/3 Packers fans or more and they were loud. The guys next to me were friendly and fortunately sympathetic as well.

Not nationally televised but still it was awful.

Not much more the Rams can do. It's evident the area doesn't care. They were gone long enough to kill the fanbase IMO.