So writing 'big boobs' in hexspeak makes you sexist.... I have a problem understanding this. Whom should this offend? How does this offend anyone? How is it

So writing 'big boobs' in hexspeak makes you sexist.... I have a problem understanding this. Whom should this offend? How does this offend anyone? How is it sexist when it didn't even specify the which sex's boob it is referring to? If I name something 'curly_blond_hair' in my code, is that sexist?