Noone would be remotely surprised if Iran attacked a nominally American target, so it's puzzling why the Iranians would talk about it instead of just doing it. They would also need to be careful not to cross the line between pressuring friends of the US administration to lean on Washington and pushing so hard that those friends double down on their commitment to the US. It's not like the Gulf states are simpatico with Iran after all, they might think for example that the Shia worldview is vaguely heretical and wacky anyway so why should they not let the US shoot at them.