They were taunting, but the fan had no right to reach on the field and touch a player. Two things can be true at the same time.
Going up to the wall is pretty much getting in the fans face. There’s no other reason to go up to the wall instead of celebrating in the end zone. Still, the fans shouldn’t be reaching over the wall. Nor should fans be throwing things at player as they enter the end zone. Some of these fans are becoming worse than Eagles fans.