I'm torn between whether it's so obvious that it doesn't need to be said, or that it's important enough that it needs to be said as often as possible anyway.
Given recent events, I would be more concerned about Chelsea staying in business -- and then in the Premiership, lest you become the Leeds of the 2010s -- than I would taking potshots at the only real team in London. Arsenal.
Along with real Chelsea fans... not the 2004-present "Chelski" supporters, who are one bad season away from switching back to Man U.