Roger is saying that Mark is detatching from his feelings. He's trying to shut himself off tot he fact that he's lost one good friend, and will lose more as the time passes. Mark isn't necessarily disagreeing with him on it, he's just stating that it's because he is, in fact, the only one out of the group who does not have HIV/AIDS.
(And Emcee, they have it as well. Or at least they did at NYTW.)
http://www.beintheheights.com/katnicole1 (Please click and help me win!)
I chose, and my world was shaken- So what?
The choice may have been mistaken,
The choosing was not...
"Every day has the potential to be the greatest day of your life." - Lin-Manuel Miranda
"And when Idina Menzel is singing, I'm always slightly worried that her teeth are going to jump out of her mouth and chase me." - Schmerg_the_Impaler