Well the word "queer" points to inadequacies when applied to a certain person or group of people. Contemporarily, it is meant to refer to GLBT people and the inadequacies that fall upon this group of people.
Initially, it meant anyone who had sex outside of marriage; to some extent this definition is still true today. The chapter talks about heterosexual men who engage in anal sex as queer; then they turn around and label gay men and women as being involved in queer relationships since they do not conform to heterosexual norms.
So the inadequacy is the simplest form of hypocrisy. You cannot claim to heterosexual, attack homosexuals, then proceed to engage in queer sexual relations. The only issue queer address is varying from the hetero-normative of one man and one woman engaging in sexual relations primarily for procreation.
If we are to look at heterosexuality and the range it takes on, we would find ourselves in the queer realm. Being heterosexual is extremely limiting, whereas being queer is liberating. I would rather not tie down my sexuality into a small box. I'm not sure how I could live like that.