"But guys such as Allen and William are more supportive than most men"

Kathy Acker's quote is likely describing the idea that some men are more supportive than others. She is likely praising the 2 guys, Allen and William, for being more encouraging than a lot of guys. This could mean that they are more understanding, more going to listen, or more ready to help out in tight spots. It might likewise indicate that they are most likely to stand up for what is right and to defend those who remain in need. This quote is likely suggested to be a tip that there are some men out there who are more helpful than others, and that these guys need to be commemorated and valued. It is likewise a suggestion that we ought to make every effort to be more encouraging of one another, no matter gender.