That's why I SPECIFICALLY said "capital gains". Only capital GAINS are taxable. Capital losses on PERSONAL ASSETS are not deductible. You are correct that you can't claim a capital loss on that piece of poop you just sold. LOL.
(Simply said: capital gains are the difference between the selling price and the purchase price, for example, selling price of $50,000 less cost of $10,000 is $40,000 capital gain).