Are you so bold as to insult God?
Proverbs 17:5 says that when you mock the poor, you insult their Maker. After all, they are made in His image. To disparage them is to speak against God. Have you ever made a passing sarcastic remark about a homeless person? And if you made that remark in front of a child or an unbeliever, you insult God and you make faith less attractive. Look, you may have just given your last ten bucks to a homeless person but at the next corner take kindness out of your wallet. You always have that to give.