The Japanese don't seem to cry, and suppressing emotions is a culture rooted in the Japanese people's consciousness. Japanese people determine the feelings of others according to their eyes, unlike Americans, who tend to identify feelings of those they interact with through their mouth expressions.
In Japan, crying and showing feelings to everyone, even women, is a sign of weakness, and most importantly, if someone cries in a public place or among a group of his colleagues - from the point of view of Japanese culture - it makes them feel uncomfortable.