Grown man laughed at my son falling on his face at the park

I told my son to jump off the big boy swing (he's 2 turning 3 in sept) and he didn't time it right and belly flopped onto the bark. He didn't even wince, I'm so proud of him! Just wiped the bark of his face and ran to the next play structure. I was thinking about the guy looking at me and laughing on the way home, and realized how pathetic that was. It's just kind of sad for him to be a grown adult laughing at toddlers potentially hurting themselves. Do better with your life, dude.