It is no excuse, but from what I have seen everyone starts out with a great attitude at the beginning of their airline career, but after years of low pay, a bad economy, almost no movement, and just endless bad news that lowers moral, many just stop caring about their profession. Again, that is not an excuse, but some reasons behind it.
I was just reflecting on my crew and a particular FA who has for three days straight, spent the entire boarding process with her back to the passengers as she texted. She then repeats the process while we deplane. It is embarrassing that she is the first and last crewmember passengers see.