Both incidents represent racism in football. Some fan being stupid or a player being stupid are both inappropriate.
Didn't get to see the Arsenal match this morning, but given the result, that's probably a good thing. From the sound of it, Swansea simply outplayed the Gunners so fair play. Arsenal has a ton of injuries right now but that's not an excuse and blame for lack of squad depth has to fall to the manager. Spend some bloody money, Arsene.