It's a pro-police flag. It's supposed to represent the thin blue line between law and order. It's routinely used by people who support the police to a weird extent and as a counter symbol to the Black Lives Matter protests/movement.

[–] baggachipz@sh.itjust.works 5 points 3 days ago

Yeah, it’s “I don’t like uppity black people” wrapped in plausible deniability.

[–] Cowbee@lemmy.ml 10 points 3 days ago

It's the "thin blue line" flag, explicit support for the Police State.

[–] AzzyDev@beehaw.org 3 points 3 days ago

It’s difficult to notice due to compression, but it has a blue stripe where one of the white stripes normally is.

https://en.wikipedia.org/wiki/Blue_Lives_Matter