If active objective=true; friendlying=false
If inactive objective=true; friendlying=true
If you want to friendly on servers with active objectives, then fine friendly all you please but do be aware of the servers you friendly on and their rules as it can get you kicked or banned. If you do, it is nobody's fault but your own for refusing to acknowledge the server rules. You also need to acknowledge that you are actively griefing your team by actively refusing to participate in assisting them. Even if you are just "a hoovy gibing sandviches" you are not assisting in any fashion. You have 0 right to complain about the server rules, you have 0 right to complain about any teammates dissing you, you have 0 right to complain about the enemy team killing you if you're friendlying.
TL;DR: Friendly in objective-based servers if you want, but it cannot and will not make you immune to consequences.