"@feliciaday, could you be considered nothing more than a glorified booth babe? You don't seem to add anything creative to the medium."
Essentially, he attacked a prominent woman in gaming, belittling her in a textbook case of gaming misogyny. The internet came down hard. Literally hundreds of people bombarded him with tweets, and bombarded Destructoid, calling for his firing. They quickly responded, and said they were ending their relationship with him.
Felicia's exact words, in discussion with Wil Wheaton: "I just get sad when guys like this are representing a voice of gaming because it shouldn't be an ok voice to have."
I think Destructoid didn't want the pressure, so they fired Perez...when even the mad cunt Jim Sterling says worse and on a more constant basis. Had Perez been a more notable personality on Dtoid, they wouldn't have fired him so quickly.