I never use the call button simply because I like to get up now and then.
I have heard a lot of stories about pax being glared and stared at ... and I believe them.
But Sunday I was in coach (

) AA SFO - ORD, and the pax ahead of me inadvertently pushed the call button. The FA came and very pleasantly asked if they needed something. Turned they didn't and the turned out the light.
Actually, though I am lucky ( or good ) enough to be able to fly up front most of the time, I have had nothing but pleasant experiences with AA FA since they adjusted to the last pay cuts.