are you buckling it tight enough? You can unscrew the cuff screw and shorten the cable for a tighter fit.... other than that, I don't see why it would be unbuckling.
Unless the buckle's spring mechanism is broken, in which case you could go to a ski shop and get a new buckle for the boot.
RE: the insult "That's gayer than AIDS"
Your insult would have made sense if it was said in the 80s or 90s, but now the incidence of AIDS is more prevalent in heterosexual individuals*... the correct way to try pwning someone with that statement now a days is to say "I'm sorry to those I offend, but that was officially more heterosexual than AIDS".
Sorry you fail.