Yeah, that guy went to an excessive level.
I've chewed people out before. In fact, I just played this one guy (beat him 5-up) who does nothing but play the same course over and over and over...and over. Before it ended, I had no problem telling him to find a new course to cherry-pick because he sucks at this one. I've also made some less-than-flattering wall posts, but I don't constantly hang out on anyone's wall for harrassment purposes. That's going too far.
Making one wall post is stating honest opinion. Anything after 1, especially with no response on your wall, is trolling and flaming.