The Birmingham midfielder was substituted in the 68th minute of West Bromwich's 3-1 win - having been booked for a lunging tackle on Gabriel Tamas. He responded to jeers from fans by lashing out at Albion season ticket-holder Sandra Cox.
Mrs Cox, who was sitting behind the dug-out in the family enclosure with seven-year-old grandson Luke, told the Daily Mail: "Bowyer called me a f****** ****. It was appalling, especially with my grandson sitting next to me. He's only seven.
"Everybody was having a go because of the tackle. Then he came over and was effing and blinding at everybody. It's terrible to hear such bad language. "We sit there so Luke doesn't have to hear it, but it's even worse because you hear all the players. I reported it to the nearest steward straight away."
Bowyer apologised immediately. He could then be seen asking fans to calm down before taking his seat to watch the rest of the match.