Crowding of the car happens in nearly every race, as does "forcing driver off the track" neither very much get penalised, unless the consequences are severe, to me it's just racing. Feel that Button made a bit too much of it, could what Button was doing behind the safety car count as "crowding"? we saw him do it China last year causing problems, nearly happened for this race.
Canada 2011 between Button and Hamilton this year, deemed by almost everyone hear as a "racing incident" but that is also "crowding".