Earlier quoted context omitted.
When I read it, the comment sounded like the emphasis was on stereotypes of the culture, not the gender. Maybe you're reading too much into it.
To be clear: comments about "polite" Japanese versus "strict" Germans and "angry" Italians are also bigoted and will make many immigrant coworkers deeply uncomfortable (especially if they are women). Everything about his comment is gross and 100% inappropriate for the workplace, and civilized society in general.
As the other commenter mentioned, "bigoted" implies "intolerant". A joke about culture differences isn't intolerant of those cultures; you're just overreacting.
And as someone else mentioned, the Japanese, Germans and Italians do not want or need you to save them. Maybe you should dial it back a bit.