When your act of kindness fails

Yea this is a crazy post, Ive been a little shaken up over it.

At the market today there was a gentleman in one of those scooters behind us in line.  I turned around as asked if he needed any assistance.  And he replies:  "I have both my arms, its my leg I am missing!"  Shocked as I was I just laughed, it was an uncomfortable laugh but I did said 'OK'  and turned back around.

Why are people so rude? I didn't mean anything 'bad' by it, I was just trying to help.  Bad enough I have been walking with a cane for the past few months. Turns out I tore a ligament in my foot so I haven't walked straight in a while.

I never felt so bad before trying to assist anyone.