It's not a formal debate, but I think it's rude to misinterpret someone in this way. It's not even a tangential point, because it's not actually connected - it's parallel.
And sure, people do that all the time. People do all sorts of things. It doesn't mean they are communicating effectively, getting any kind of point across or coming to any conclusion at all.
I could start into semantics too, for example saying that people don't bring up tangential points because tangents aren't points they are lines. It wouldn't be a good idea, because it wouldn't further the discussion at all. That's basically what I see happened here.
Pointing out unintended implications of what someone said isn't misinterpreting them. It's connected to the claim parenting is a socially acceptable way for women to avoid work. Their point was clear. The verbal meanings of tangent and point don't disrespect geometry.
