When I first started, a sage advisor told me to ignore the A2B’s. I had no idea what he was talking about.
He said that anyone who pays their two bucks admission feels as though that gives them carte blanche to say whatever they want to the umpires. It took some time to learn to ignore them, but now I do not really even hear them anymore.
My focus has to be between the lines to be any good. My focus has to be on positioning, mechanics, and the game itself. That intense focus blocks out the jackass on the first base line. It does not, however, prevent me from seeing the looker down the third base line!