Supermonkey is spot on. Referee had to do something and he did; 2 off, nobody really complaining, case closed. No referee wants to dismiss a player in a friendly game, I thought he dealt with it well, if no VC reaction then it would have been dealt with a lot differently, but there was, 10 minutes left, two silly players put themselves in the position where the referee had to deal with them and he did. The reaction from Sterling, i.e. no reaction spoke a thousands words in that he knew what he did and / or was trying to do.
In terms of the Sterling 'challenge' it was in my opinion and this opinion has divided people, was excessive in the circumstances, he was going for the ball but was trying to let his opponent know about it took and slightly overstepped the mark... maybe is was a Liverpool - Man Utd tackle... luckily Valencia was nimble footed and managed to ride most of it.