Tamasic charity gets everything wrong. The place is wrong. The time is wrong. The recipient is undeserving. And to make matters worse, the giving is done without respect — or with open contempt.
Giving is a noble act, but giving carelessly or insultingly strips it of all value. Tossing something at a person in need with a sneer on your face — that is not generosity. It wounds the receiver and corrupts the giver.
Charity requires both warmth and discernment. Without discernment, the gift misses its mark. Without warmth, it becomes an act of humiliation. Tamasic charity satisfies neither the giver nor the receiver.