It usually means they’re boring and they don’t have the romanticized notion of gentlemen manners. e.g: holding doors, etc... It’s simply not engrained in the culture in Japan, whereas in places like Canada - you’ll do such casual acts of kindness to strangers.

Then they should be prepared to be disappointed. They really look down on non-Japanese asians and most of the so-called Gaisen only specialize with White or sometimes black foreigners.