It's easy to forget NFL players are fans just like everyone else before they enter the league, but, nonetheless, they must abide by some unwritten rules.

One of those rules is fairly obvious: Don't support other teams. No matter what.

Denver Broncos linebacker Shane Ray got a rude awakening to that rule when he had the logo of the division-rival Kansas City Chiefs tattooed on his back in March.

Minnesota Vikings rookie receiver Laquon Treadwell didn't go as far as inking his skin, but he's been under fire by the team's social media police since posting a video to Snapchat while wearing an Oakland Raiders hat.

man laquon treadwell dead to me pic.twitter.com/fmidrh8ME6 — PacSun lynch (@yawnSwanson) June 1, 2016

Treadwell wearing a Raiders cap...isn't right with me 🤔 — Joshua Handy (@jce_handy) May 31, 2016

@SuccessfulQuon Next time you need a Black Cap I'll send you @Vikings. When you put that hat on at draft it means you represent the purple. — Lance Morales (@MoralesLance) June 3, 2016

@SuccessfulQuon Why wear the #raiders cap when your suppose to support the team who drafted you remember #vikings cmon Q. — Mark Shinn (@MShinn65) June 1, 2016

@Vikings soooo after seeing Treadwell in a Raiders hat, can we trade him for Amari Cooper or what? — Johl wallace (@SkolLife) June 1, 2016

Raiders fans, on the other hand, are quite pleased with Treadwell's hat choice.

Hey Laquon Treadwell, save that #Raiders hat. Maybe when you're done with the #Vikings, you can come on over to The Dark Side. Coop & Tread. — Maurice Moton (@MoeMoton) June 2, 2016

@SuccessfulQuon When your contract is up, please join Carr and Cooper in Oakland #Raiders — Tyler Green (@TylerGreenSB) June 2, 2016