Hackerdom is still predominantly male. However, the percentage of women is clearly higher than the low-single-digit range typical for technical professions, and female hackers are generally respected and dealt with as equals. (Alas the evidence shows this is still at best aspirational rather than true, but by no means impossible to achieve.)
In the U.S., hackerdom is predominantly Caucasian with strong minorities of Jews (East Coast) and Orientals (West Coast). The Jewish contingent has exerted a particularly pervasive cultural influence (see Food, above, and note that several common jargon terms are obviously mutated Yiddish).
The ethnic distribution of hackers is understood by them to be a function of which ethnic groups tend to seek and value education. Racial and ethnic prejudice is notably uncommon and tends to be met with freezing contempt.
When asked, hackers often ascribe their culture’s gender- and color-blindness to a positive effect of text-only network channels, and this is doubtless a powerful influence. Also, the ties many hackers have to AI research and SF literature may have helped them to develop an idea of personhood that is inclusive rather than exclusive – after all, if one’s imagination readily grants full human rights to future AI programs, robots, dolphins, and extraterrestrial aliens, mere color and gender can’t seem very important any more.
The trouble with supposed "gender" and "colour" blindness is again that the real life evidence demonstrates that while these may be fondly aspired to states, they do not exist for the most part and do require som care and attention to achieve. Not via the good for public relations and appearances "diversity, equity, and inclusion" nonsense, but more fundamental changes that take longer to stick and have an impact. For a great introduction with specific examples, there are two books that are fast and excellent sources: Weapons of Math Destruction by Cathy O'Neil and Race After Technology by Ruha Benjamin. A good complement to these is Janelle Shane's You Look Like a Thing and I Love You.