I’ve seen several of those flags in Southwestern PA. I’m not aware of any controversy surrounding them.
Interestingly, while watching the RSBN lead up to the Trump Rally, they were working the crowd outside the venue and were discussing/interviewing a couple of very Christian people. In the background, on occasion an F&&& Biden flag would unfurl and show on camera.
I chuckled, but I’m sure that it would offend some.