If friending the author of bad-ish review of your book on Facebook is inappropriate, then I take everything back

So my review of "How to Be Inappropriate" by Daniel Nester went up early this morning on Vol. 1 Brooklyn, and before I'd even gotten a chance to look at it, the author had already posted a link on Facebook and sent me a message thanking me for writing it, apparently before I'd even woken up. Indeed, not everything in the review is glowing, but for the record, he perhaps thought I disliked the journalistic pieces more than I actually did. In any case, he was gentleman enough to not take it personally. Is that the ultimate impropriety? Or is it perhaps, actually, old-fashioned politeness? In any case, well played, Mr. Nester.