Um, so the " 'd " suggests that something has been affected by a noun.
In this case, the statement "every disputant is partly right and partly wrong" is affected by generalization. In that it is, er, a false generalization.
What do you mean "the statement is affected by a generalisation"? What does it mean for something to be "affected by a generalisation"? What does it mean for a statement to be "affected"?
The claim is a general one. Are general claims always false? I highly doubt that. That said, this generalisation might be false, but it seems like establishing that would require more than just pointing out that the claim is general.
Here's the new thread for posting quotes, with the usual rules: