The context was that he had requested to come in. The impression left by the broadcast was that he blamed the team for not calling him in for his stop on the previous lap. If the team are going to let the two race, then they need to let each driver use whatever advantage he can take. Just like the prohibition on using a richer fuel setting to catch/hold off the other, I think this approach will only make the tension worse. If you let the guy in front have pitstop preference at Monaco, it's not even a race. It's not like anyone is even close to them in the championship.