Investment mortgage debt is good if it contributes to tax deductible claims. Owner-occupied debt is good if it’s managed properly. Both are good because you own an appreciating asset.
Credit card debt is good if you don’t hit payable interest, leaving your money to work for you in other ways.
Commodity debt is good if the market swings in your favour.
Business debt is good if it results in surplus revenue generated.
Education debt is good if it’s contributing to future and higher employment gains.
Basically all debt is good if it’s managed properly and results in a net gain somewhere.