I tend to work both ways, so don't ask me.

If I'm the Spy, I always get the Sniper without him knowing

If I'm the Sniper, I always know the Spy is there, because I try to walk back into cover and get stuck, I turn, Jarate, and Kukri that guy. If he starts using Revolver, I noscope him.

Yea I don't really think spies are much of an issue. Yea it can be frustrating when you get owned over and over by a really good one, but I just see it as the natural order of things.

And besides good ones aren't even that common. A lot of times you'll just see one, or bump into him and whatnot. Unless hes a crackshot with an ambassador (WHY WONT YOU DROP FOR MEEEEEE?!) hes going to die swiftly from a Kukri to the face.

Also, the razorback is awesome against spies, I don't know what your going on about with that. The trick is to be playing with the sound on and paying attention. Even scoped you will hear the failed backstab, just swap the kukri and start going to town on him. I know everyone says the Razorback is horrible, but when you get in a game where there are 4-5 spies for some ungodly reason, you find it to be useful.