I don't know what has got your goat JPINFV, but you are better than this.
Here's my issue. I agree that taking constant phone calls can cause an issue. Text messages? Not so much. I view it in the same light as messaging through G Chat or Facebook, or what have you. If it's not making any sound, there should be little issue.
So, lets' start over.
We're both taking our experiences as instructor and student respectively and extrapolating it. Additionally, I did take the implication that the primary reason why notes are taken on a computer is because of poor hand writing personally. Also, to clarify, it wasn't the "your" (I generally treat "you" as being generic, not directed at anyone specific, in situations like this) that I took personally, but the overall message. Yea, my hand writing is terrible, however I don't have a problem decrypting my handwriting. What's more important to me is not having to print out and assemble a couple hundred pages of slides, many of which have dubious quality in the sense of note taking. I'm not much of a tree huger, but if I can be more efficient, I'll be more efficient, and electronic note taking allows that.
In my experience, using my learning style, live lectures are more often than not a waste of time given how they are designed, the quality of the lecturer (let's speak real slow and read off the slides verbatim), and the fact that my attention span is only about 30-40 minutes and watching recordings allows me to speed up the video to obtain a watchable speed, as well as pause, rewind, and fast forward through breaks at will. The only reason I attend lectures is because of the quiz at the start and the potential for a pop quiz at the end. Besides that, the 4 hours a day of lecture is mostly a waste of time. Considering that probably about 1/3 of the class would attend if it wasn't for the threat of quizzes, instead opting to watch lecture recordings, I don't feel that I'm alone with this assessment or learning style.
Similarly, in my experience, lecturers often talk about their 1 or 2 hours, but don't realize (or, and hopefully not, don't care) that the student may have several more hours in a row. Your two hours may just be a part of a 7-8 hours of lecture for the students. When I'm sitting down for 7-8 hours almost straight (even with the 5-10 minute breaks every hour and an hour lunch), there's still a lot of information being imparted of varying qualities, and I'm not going to be very receptive to someone saying "Well, I'm only 2 hours," especially when, in my case (your money will vary), I'm paying $40-50k a year. In my case, if a lecturer isn't getting paid, then I'm sorry they're getting screwed, but at that cost I do expect quality professors that lecture well and can be understood. Similarly, I don't consider a professor to be on their time off, since I expect that at least part of my tuition is going to pay professors, hence making this a job and not a day off. If one of your employees or coworkers came in and expected an easier time because they worked on a day off from their other job, how would you respond?
Finally, in my experience, most classrooms set up for projectors and most lecture halls are set up so that the lights can be varied by zone. In general, the lights over the stage will be darker with the amount of light rapidly increasing until fully on near the back. Overall, I'd say the lights are slightly dimmed moreso than dark or darkened. Granted, this is a bit of a semantics argument, but given how lights are set up, I can understand how some rooms would honestly need to be dark to properly use a projector. It's just that the last time I've been in someplace similar to that would have had to been almost a decade ago in high school. So I'm not trying to play semantics for the sake of playing semantics.
In general, I haven't noticed laptops giving off any appreciable glow to be distracted by. Similarly, unless it's something like World Cup soccer (there's a picture from last year of 4-5 computers in different rows streaming a game) where I choose to be distracted, I'm not distracted from the content on another person's computer. Similarly, given the same lighting situation, cell phones don't give off any appreciable glow.
Unfortunately, at least in medical school, "respect" and "professionalism" are more often thrown about as, "You did something that made someone else mad, but we can't actually explain why what you did was wrong, so we're just going to call it unprofessional or disrespectful."