The common projection of a liberal agenda or basis unto this guy Woodger's goofy PC censorship is almost as strange - and illuminating - as the firing itself. I've worked for some woodgers in my life - the entertainment value suffers diminishing returns as time goes by. I was never lucky enough to get fired, either.
In my US neighborhood, and on TV sports shows (where they are both heard, Aaron more frequently), Aaron is pronounced farther back in the mouth and more open throughout - "air on" to "air un" - while Erin is toward the front more - "ehr in" is closer. So the ending position of the tongue tends to be tip on the hard palate and hollow curled for Aaron, and flat to the palate with the tip on the teeth for Erin.