I dunno, I disagree. I think it is disrespectful. Like the wheelchair example I stated originally ... aside from my bed and my office chair, I spend more time on my bike than anything else. For someone to use it as a lean on ... I think that is disrespectful. My bikes don't own me, obviously, but they are easily the most important material possessions I have.
If I were a girl and some guy on MARTA was grabbin my ass, I would also be pissed, btw.