Too many negatives
That type of double negative is all too common now and in many cases if you point it out to someone they don’t seem to understand what you are trying to tell them. When I was a child even the least uneducated seemed to know better than that. Oh, yes, we would often say, “I can’t get no” like the Rolling Stones but we knew better than to say, “If you don’t think what I do is not hard” when we meant the opposite. We would say, “If you think what I do ain’t hard” or “If you don’t think what I do is hard”.