Police said he was caught on film making the abuse and gestures by “evidence gatherers” for the force inside the stands.
He was charged with a public order offence and appeared at Leeds Magistrates Court in May, where he pleaded guilty and received a fine.
Now the force has said that magistrates have approved an application for a five-year football banning order against Slater.
Chief Inspector Pete Hall, who led the policing operation at the match, said: “The words and gestures used by Slater were likely to cause harassment, alarm and distress to anyone within hearing distance of him, and anyone who behaves in this way should be prepared to face the consequences.