I'm not going to give a homeless man money.
That's disheartening. Why would you decline to give the homeless man some money?
I don't care abut him.
You should have some empathy for the plight of those less fortunate than yourself. Give the homeless man a little of your money.
Nah.
I can't tell you what you do but I hope you reconsider this and help out the homeless man. He may have had a tough time and need the assistance that they can get, and you helping him that day may be only one of the few he will receive that day so I hope you do so.