2) Of course it wasn't an accident. `man` is a shorthand for manual that led to plenty of jokes. `bro` serves a complementary function to `man`, and thus it humorously references its inspiration and sibling program using a diminutive.
Yet you also show ignorance of etymology. The term "bro" didn't originate with "brogramming", which is a very recent neologism and not widely known outside of hipster tech communities and feminist circles. "Bro" and "bromance" have been around for a long time. How does having a fake "X-GirlsAreBrosToo" header imply "brogramming"?