from the link:
It does not state that if paid with a check, you are not entitled to a receipt. It merely continues and states the check can be used as a receipt.If you pay your rent in cash or with a money order, you should ask your landlord for a signed and dated receipt. Legally, you are entitled to a written receipt whenever you pay your rent.97 If you pay with a check, you can use the canceled check as a receipt. Keep the receipts or canceled checks so that you will have records of your payments in case of a dispute.
A payment with a check demands a receipt as well. You give a receipt for a check tendered for whatever amount written for and for whatever purpose it was tendered.
It does not imply the check is good. It does not prevent the recipient from making a claim against the payer if it is not negotiable.
Your boss when you were 16 is the moron, both for what he said and for how he said it.

