routing for someone to get hurt or throwing things is completely out of line but yelling things at players as long as its not too bad is fine. i personally like it when a player jars back.
as for away fans being taunted, well if fans are on the same side thats gonna happen. thats on whoever told the fans to sit on the same side. in some instances like BC its different cuz there really isnt any away stands but in instances when away fans come over to the home side, they better expect to get ridiculed unless their team is up.