Rehearsal etiquette?

It seems that technology needs to come with a manners manual. At orchestra rehearsal tonight I noticed the usually talkative student bass players were very quiet in addition to not noodling (playing while director is talking). To my utter amazement, one of them had his laptop open and running so they could watch the basketball game DURING rehearsal.

I couldn't believe what I was seeing... Brahms was certainly turning in his grave. 

Either that or shooting hoops!