To my understanding, Liefeld wrote the character for his first dozen appearances, giving him only the very shallowest characterization, then completely abandoned him for like twenty years, leaving other writers to develop him nearly from scratch. These other writers have been heavily implying that the character is gay for over a decade (I'm talking Cable-And-Deadpool-level implications, here).
Now the implications finally pay off, and suddenly Liefeld is bitching?
Even though he has had absolutely nothing to do with the development of the character for two decades, and never gave him much of a characterization to begin with?
Even though the anvilicous implications have been going on for over a decade, and he never objected to them?
Even though he doesn't own the character anyway, and Marvel has been making huge changes to all of his creations for decades, and he never objected to those either?
Even though the other creator of the character, Fabian Nicieza, admitted that he meant for the character to eventually develop a sexuality?