Let's say someone states that if party A wins the elections, they will start killing opponents. Of course, let's say there is absolutely no evidence that support that claim and in a debate I state that they are plainly lying and that it is OK that the social media tag it as a lie.
But then, as part of the debate, someone states that they cannot be lying because they are talking about the future, something that still has not happened, and even if there is little chances it happens, he won't be lying until the moment happens and either they were right or wrong. This doesn't make any sense to me, as it is also possible to state undetermined future assertations and they would never be a lie. "One day will come when the unicorns will take over humanity" or some other silly examples, following that logic, couldn't never be a lie.