No surprise here. The first thing a Harvard grad will tell you is that they graduated from Harvard.
It could well be a HBS-only thing, though. They have their own thing going on.
[1] http://www.thecrimson.com/article/2011/9/15/harvard-students...
[2] http://www.slate.com/blogs/browbeat/2014/05/30/harvard_grads...
Wharton grads, on the other hand... Never more than 10 minutes before they drop it in.
People with substance don't need to flash their Ivy League emblem everywhere.