I think it's a fair ban, especially at a time where soft bans are being given - 2 weeks for Cian Healy's stamp! - it's totally unsporting and unprofessional, you don't call referee's cheats, I do, however, feel sorry for Hartley because he was in the Lions squad and more than likely to start as well, and to miss out is heartbreaking, that said, I'm glad his ban will set the precedent. His initial denial was probably out of pure reflex action and after thinking about it, he's decided he's going to admit he's in the wrong - just my opinion.
It's 2 totally different cultures when it come to respecting officials in rugby and football, I personally think FIFA should take a hard line stance on this, seeing hordes of players surrounding the referee isn't a nice sight and the ref should just be able to make decisions without being pressurised in any way, there should only be dialogue between captain and ref and or, a player the referee wants to talk to, I do think a referee should send players off for calling them cheats - I've probably got these opinions because I play rugby, but that's my opinion.