Jerkiness (I just made that word up!), like beauty, is in the eye of the beholder. Yes, talking too loud in public places, whether using a phone or not, is rude, but, to me, doesn't make that person a jerk. Parking in a handicap spot when you are not handicapped does make you a jerk. Using social media to constantly complain about the jerkiness of others via cell phones or tats or other harmless activities may or may not make you a jerk. Abusing the wait staff at your local eatery definitely makes you a jerk. Failure to use your turn signals? Maybe. Driving in the passing lane when you are not passing anyone makes you a jerk.
YMMV. Have a nice day.
YMMV. Have a nice day.