As I read your post, I too felt saddened. It is just down right MEAN to watch someone fall and not offer to help them get up. I am sure that the parents of the students who laughed would be extremely dissappointed in the behavior of their children.......or maybe if you by chance ever see them again....you can make a comment in "jest" mentioning "thanks for helping me up from my fall the other day......."
I know that this hurts your feelings worse than your knees......and I am just speechless as to what is WRONG WITH PEOPLE!!!But, then again.....I watched the news lately where a young man robbed and punched in the face...... a 90 year old lady....this too makes we want to grab them by their ear...like my granny did......
I hope you feel better....