The example of 'live music' here is distracting because in a lot of cases 'live music' shows entail a kind of socialization that only extroverts enjoy. So the aversion could have been much more complex and less likely to be solved by introspection alone had you not been so confident that it was your hand. Should we not qualify, then, that some kinds of aversions are systematic to one's personality as a whole and so less likely to be revealed by introspection?