I've seen some really poor form with target shooters here in Colorado too.
Worst one was a group of guys on USFS land that parked and started shooting their AR's on top of a small ridge without checking what was behind and down the ridge less than 200 yards away from their targets - campsites. Designated numbered campsites occupied by families with kids. The campers called 911 and vacated their campsites when bullets started wizzing above their heads and hitting branches behind their camp as they were eating breakfast.
Second worst was a father and 10 year old son shooting across a busy forest service road and when confronted by people walking their dogs down the road the father got very verbally combative in front of his own kid. Great parenting dad.
Don't get me started with the amount of trash target shooters leave behind. I'm constantly cleaning up one of my favorite places to shoot so that it doesn't get closed due to others being slobs.