Before he was suspended, Zaire Byrd was thriving. He acted in school plays, played on the football team and trained with other athletes. He had never been suspended before — he’d never even received detention. But when Byrd got involved in a fight after school one day, none of that seemed to matter to administrators. Byrd said he was defending himself and two friends after three other students threatened to rob them. Administrators at Tri-Cities High School in Georgia called the altercation a “group fight” — an automatic 10-day suspension. After a disciplinary hearing, they sent him to an alternative school. The…