Human interaction is fundamentally persuasive, even when completely unintentional. I don't think you can get around that.
You can go after "all altruism is selfish" argument but you'll end up having to settle with "some altruism is more selfish than others"
Another situation: when I play chess online I'm interacting with people. You can argue they're persuading me about how best to play chess, but that isn't their motive nor is there a set conclusion they're trying to make me reach
You should narrow persuasion from "interaction" to a kind of conversation (such as those found in HN threads), otherwise you could start arguing all information inputs are persuasion regardless of whether the source is human