ESPN football insider Adam Schefter angered Chiefs fans (and a former player) with messages about Patrick Mahomes and penalties.

ESPN NFL insider Adam Schefter is taking some serious heat for his pregame tweet about Kansas City Chiefs quarterback Patrick Mahomes on Sunday. The Chiefs are scheduled to take on the Bills on Sunday ...

Yet over the weekend, ESPN analyst Adam Schefter appeared to play into that viral narrative when he framed a tweet about NFL ...

Bills fans responded by making fun of Schefter, who blocked various fans on Twitter. Schefter's move led another fan Del Reid to respond with the hashtag #BillsMafia, and the name was born.

Angry football fans want ESPN to discipline NFL insider Adam Schefter following a bizarre tweet about Patrick Mahomes.