6 am. The restaurant was not busy, it was a McDonald's truck performing a delivery. He parked, probably in the same spot he always does, and you just so happened to pull up wanting to eat.

Instead of looking at this moment as an unfortunate incident that you and the driver were there at the same time. You have chosen to look at it as discrimination. I can't say for sure, but I don't think the driver pulled up and said, "Screw those handicapped spots! I hate them!! a ha ha ha ha!" No, he probably parks in the same spot every delivery.

You have a valid complaint, but for the wrong reason. You could've handled this right there by driving through the drive thru and talking to someone right there at that moment. But no, you chose to take offense and fire off an angry letter accusing someone who is doing their job of discrimination against you over what is probably an oversight.