What, on the whole, is Dougless’s attitude towards white people? Examine his statements about them and establish as far as possible his feelings regarding their charterers. Is he bitter about his slavery experiences?

This is only a short answer space and your question is pretty detailed. I can make a general comment though. Frederick doesn't paint all white people with one brush. There were certainly white abolitionists that Frederick admired. He was even sympathetic to "kind masters". Frederick does reflect of the nature of slavery: the ignorance of slavery turns some blacks and whites into loathsome people. Slaves became used to lying about being happy with their master and situation for fear that they would be punished otherwise. Slavery also ruined slaveholders, turning them from kind and fair individuals (such as Mrs. Auld) to individuals that delighted in and abused power. Slavery ruined not only individual lives but poisoned all of southern society.