The first point is that citizenship is not the controlling issue, jurisdiction is. A US citizen in Saudi Arabia is subject to Saudi law, a Saudi citizen in the US is subject to US law. I assume the speaker is in the US.
Under US law, there are a few limits on making false statements. For example, you cannot lie under oath (for example when testifying in a trial). You also cannot lie to governmental investigators dealing with a legal matter (investigating a crime). You also cannot make a false statement that harms a person's reputation ("defamation") but you can make a false statement that enhances their reputation. We'll keep this on in reserve for a moment. Then you also cannot make a false representation in order to gain a person's willingness to enter into a contract (fraud), for example you can't sell a thing as a "pig in a poke sack" when in fact it is a golf ball. Finally, there could be some contractual situation where you are required to respond truthfully to questions.
Your main concerns here would be defamation and fraud. If you make false defamatory statements to Chris about Jones, Jones can sue you for defamation. You cannot sue yourself and Chris cannot sue you, because only Jones has been harmed by those statements. Your mother might sue you because you falsely reported that she died of a heroin overdose.
You might also be sued by Chris for fraud, if you provide false information that forms the basis of a sales contract, for example if you claim to be a licensed electrician (you are actually an otolaryngologist)
and Chris relies on your representation as a basis for sending you a free multimeter. Whatever the case may be, Chris would have to have been harmed by relying on your assurances in forming this contract. It does not matter if Chris works in the US, or in Timbuktu. However, Chris might try hauling you into Timbuktu courts to sue you for violating some local law such as Mandate #974 to always tell the truth to a telemarketer. US courts will not enforce any judgment against you entered under those circumstances. No stable, recognized jurisdiction imposes a legal mandate to always tell the truth, so there is no practical possibility to getting sued for telling a lie in order to annoy or waste the time of a telemarketer, and US courts would not enforce any such judgment.
