Ranting and Raving

What the hell is with people at these dog parks? They bring there dogs to get exercise and play and when they actually do it ya freak out. Dogs play roughly together. Thats just the way it is. Some owners cant seem to accept this behaviour from thier dogs (poor dogs) and get really pissed when another dog comes to investigate and do thier doggy thing. This really does my head in. What do you think?