Russia? China? Any mostly Muslim country? Mexico? Even Canada or any European country?
The UK is the only other nation I can imagine being allowed to sleep on our couch rent-free and raid our fridge to this extent, and there's an incredibly deep cultural and political lineage connection there. Even with all that, if the UK had its hooks in this deep there'd be more outrage. "Didn't we throw the British crown out 250 years ago?"
Though I do have to say: there should also be more outrage at the influence of Saudi Arabia. But that one has an easy financial explanation. The net flow of cash is from SA to the US in exchange for influence and military support. In that case they're living on our couch and raiding the fridge but are paying rent for the privilege.