If you'd be disruptive answering a call, guess what, answering a SMS is probably as disruptive. I hate when in the middle of a meeting, there's a guy in the corner texting on his phone. I find that much more rude than someone excusing themselves and going out to take a call.
Anyway, I'm not going to win here. Old guard vs new guard. I just find you guys highly disconnected and annoying. Not to mention a lot more dangerous on the road.
I work in the medical field, where people are constantly paged at meetings and elsewhere. When I get paged, I have to look at the message to see if it's something that needs my immediate attention or can wait. Same with text messages, with the added advantage that I can type a quick "OK" to let the sender know that I got their message. With voice calls, the most I can see is the caller's ID some of the time - I have to answer the call just to see what it's about, and that is always more disruptive.
And please don't paint everyone with the same broad brush. I never said anything about texting while driving, which I agree is dangerous.