Did the representatives of the First Continental Congress were angry at the Britain?

Yes, the representatives of the First Continental Congress were indeed angry at Britain. They were frustrated by a series of punitive laws and taxes imposed by the British government, which they felt violated their rights as Englishmen. This anger was evident in their discussions and the decisions they made to organize resistance, including the formation of a boycott against British goods and the call for a Second Continental Congress if their grievances were not addressed.