Gayle had been warned previously a couple of times about time wasting which was then followed up by his first booking. The 2nd although harsh was the result of persistent fouling, he could have picked up a 2nd yellow just before when he fouled a villa player on the halfway line. I really dont think Scott was as bad as some are making out.
As mentioned Gayle didn't waste time, he just didn't run 40 yards to take a throw in. Nowhere does it say you need to jog off the pitch. What makes it worse is that the Villa player prevented us taking a quick throw. Once we couldn't then we wanted Gayle to launch it. Pretty much every game will have subs walk off the pitch, or players go down injured right over the other side so they can stroll off it slowly. Are they getting penalised for time wasting? No.
As for the persistant foul, that's usually when they have made 5 or so niggly fouls, even then you very rarely (if ever) see a ref produce a second yellow for a very minor foul if it results in a red.
There was nothing he could do about the foul, he HAS to go for that ball, it was 50-50. He also HAS to commit to the cross early. When he realised it was the keepers ball then he pulled out but momentum carried him into the player. He can't work against physics. If he had not gone for the ball and the keeper hadn't reached it we would be crucifying him.
The reaction of the players\crowd\bench and a ref easily persuaded are what got him sent off.