It sounds like your husband parked way to close to where the workers and got in their way. He then chose to start a confrontation with the workers. How did you expect them to react?

If your husband was healthy enough to start a confrontation with the workers then his apparent illness and chemotherapy have nothing to do with this situation and appear to be a transparent sympathy grab.

What does the ethnicity of the workers have to do with anything? Such references only make you look like a racist.

The terms WTF and ass do not belong in any business letter.