You say it's a one-lane road, but also that the truck was in the oncoming lane while the driver spoke to you. So I'm not sure what the setting is. If you mean that it's a two-lane road (one lane in each direction) that's narrow enough that two motor vehicles and one bicycle won't fit comfortable across it, then jpo's advice to discourage drivers from making unsafe passes in the face of oncoming traffic is good advice (with the major exception that if drivers in the oncoming lane have a dotted line and can pass slower motor vehicles in their lane, I would likely stay as far right as possible; if you think being squeeze-passed by a car moving in the same direction as you is scary, you wouldn't believe how it feels when it's an oncoming car). As a general matter, though, defaulting to "somewhere between the absolute middle of the road and the right tire track" likely means you're often riding farther from the edge of the road than you need to be. I don't know whether Jamesqf is right that doing so would make you more likely to get hit (I've been solidly in the shoulder both times that I've been hit while riding), but it does make you more likely to have conflicts with motor vehicle drivers, likely without otherwise improving your situation. Although there are very few instances of this being true, California law is actually decent advice on this subject. To paraphrase: If you're moving more slowly than the prevailing speed of traffic, ride as far right as practicable. You have the best view of the relevant section of road and should use your judgment to decide how far right to ride (and considering "the squeeze pass" is valid), but it's unlikely that it will typically mean riding between the typical tire tracks.
