Vettels such a wanker, "well he didn't complain to me about it" trying to call out Button as someone dis-honest or dishonorable. We all know that it doesn't work like that in F1. If there's a problem on track the teams get pro-active to get the other car penalized, not the driver.
A more passionate response would have made better TV indeed but I think he was just wise enough to know Vettel did not need him to make himself look like an arse on stage (as he did).
There is just not much in it, pointing the finger when the legality of the move was not in question and was being handled at the time.