What evidence does Equiano provide to support his claim that free blacks had more difficulties than slaves did?

From the text:

There was a free black man, a carpenter, that I knew, who, for asking a gentleman that he worked for for the money he had earned, was put into gaol; and afterwards this oppressed man was sent from Georgia, with false accusations, of an intention to set the gentleman's house on fire, and run away with his slaves.

"..... while I was a little way out of the town of Savannah, I was beset by two white men, who meant to play their usual tricks with me in the way of kidnapping. As soon as these men accosted me, one of them said to the other, 'This is the very fellow we are looking for that you lost:' and the other swore immediately that I was the identical person. On this they made up to me, and were about to handle me; but I told them to be still and keep off; for I had seen those kind of tricks played upon other free blacks, and they must not think to serve me so. "