What can I do if I am always being followed in walmart by a manager everytime I go into the store?

Everytime I go into wal-mart to shop and this one manager is on her shift she continues to follow me and my friend throughout the store. To be spiteful we would go around the isle's and go back and forth to try to make her annoyed enough to back off... but we see very clearly that we are being followed. She even tells other employees to ask "if we need help finding anything, etc..." (they ask us multiple times when we are in there) Me and my friend both have clean records and don't steal, is there anything we can do about this, such as harment and how would we go about doing it? It happens everytime we shop there.