It mostly boils done to having inexperienced airsofters running with guns that shoot really hard. That's why it's generally frowned upon to see a new guy, especially a new guy that's new to airsoft with a high powered rifle.
So provided you are a responsible player, have a sidearm like you do, and know it's really not okay to shoot someone closer then a couple dozen foot or more (depending on the actual power of your gun)
Don't quote me, but i think our minimum safe engagement distance or MED is something like 40ft if your shooting at our semi auto limit of 2.28J or about 495fps with 0.20g BBs.
Welcome to the forum, and to airsoft btw