Of course they apply to away supporters, but experience shows that sadly they aren't always enforced - thats where the lack of consistency and double standards don't help punters accept the stewards approach.
I have sympathy up to a point but the Grounds Regs aren't rocket science so if you continually stand then there will most likely be only one outcome. The stewards are only there to ensure that the Ground Regs are observed and most stewards are aren't looking for any aggro but have to act if...