Safety is everone's responsibility. "You must be your brothers keeper." Ref's and people who work at the field have small numbers. One or two refs can not watch/control 40-50 people very effectively. We have to have the burden of aiding them to keep the place safe. We would all feel pretty lousy if we had a guy we would have helped and a minute later lost an eye for life. A quick reminder keeps everyone safe. If the guy has hurt feelings oh well, he will get over it. If a person in the crowd wants to criticize the way the message was delivered I would ask them how they would feel knowing they could have helped prevent an injury and felt it was below them because they did not work there.