Typically the only time I get 1vX'd is when I mess up my movement and find myself in the wrong place at the wrong time. After a while of doing PvP you begin to recognize patterns of movement and how to respond in turn. We all screw up as human nature so I just chalk it up as a learning experience and move on.
"Why are my allies letting that person kill them over and over? Let's find a more useful/achievable objective." One should always decline to feed AP to your enemies (unless it's a tactical move to distract them from something more important).