Unfortunately for guys like that its the 'all the gear and no idea' and can't play tactics for toffee and dont know how, there part of the 'spray and pray' culture
As you said, sink all the money into the rifle etc, dont let them get you down, once you start tagging them and get better with tactics, it turns into a 2 sided game for you and you'll realise your tactics are better
There are so many ex military of us in the sport, you can tell us apart from the others, talk to and stick with us and you'll learn so much
The amount of times I've snuck around/up on people and tapped them on the shoulder its unreal, they hate it when you do that