The most accurate explanation for why the end of salutary neglect made the American colonies angry is:
The colonies had gotten used to being able to trade with whomever they wanted and paying lower taxes.
This reflects how the end of salutary neglect, which allowed the colonies greater autonomy in trade and governance, led to resentment when Britain began to enforce stricter regulations and taxes. The colonies were accustomed to a level of economic freedom and felt that the new laws infringed on their rights and economic interests.