Can a Person Be Non Sequitur?

When someone says a non sequitur, it usually means the person was off in her own thoughts and not listening to the other person.

Can a non sequitur be valid?

material fallacies

(7) The fallacy of non sequitur (“it does not follow”) occurs when there is not even a deceptively plausible appearance of valid reasoning, because there is an obvious lack of connection between the given premises and the conclusion drawn from them.

Is non sequitur a fallacy?

A non sequitur is a fallacy in which a conclusion does not follow logically from what preceded it. Also known as irrelevant reason and fallacy of the consequent.