Upper class: often flawlessly ethical, never moral.

Working class: sometimes moral, often indifferent to formal ethics that they feel were set in place without their consent.

The social language of appearing to avoid conflicts of interest and self-dealing is one in which upper-middle and upper class people are fluent. In terms of morality (avoiding harm, rather than avoiding violations of semiformal social principles) there is a negative correlation to SES, but it’s very slight because it turns out there are also scoundrels at the bottom.