Deductions & credits

I'm confused, I thought that a 1099K for personal items sold at a loss was not reportable or deductible.  MA and VT have the lower $600 reporting threshold and the FAQ on their official websites gives specific examples of when a 1099 isn't reportable as income.  One example speaks to selling used personal items at a loss and states the income on a 1099k in that scenario is not reportable or taxable. In addition, IRS publication 544 states losses on the sale of personal property are not tax deductible.  I'm trying to ensure I am not reporting things on a tax return that do not belong or taking deductions that are not allowed