There is nothing inherently wrong with a scything challenge. If Skrtel comes charging in with a fair challenge, winning the ball and completely taking out Bale in the process theres nothing wrong with that. Football is a physical game and a player like Bale needs to be able to handle it.If however it is not a fair challenge and he gets take out with Skrtel getting nowhere near the ball then let the referees handle it, dish out yellow (and red) cards. Thats exactly what happened at White Hart Lane, they did the same thing to Bale but he skipped past them, took the challenges and got players sent off.
I'm not upset about him jumping out of the way of challenges, he takes more abuse from defenders than most and is well within his rights to protect himself, but if he does then he needs to get straight back up and not sit and claim to have been fouled as he did today.