(Edit: This turned out to be a fairly unoriginal sentiment as usual)

You'll be a real programmer if you:

• only use keyboard based text editors and a shell, no IDEs
• use mechanical keyboards of the hand soldered, ergonomically split, non-traditional/ optimized key layout variety
• become a rabid fan of whatever language or ecosystem you happen to fall into and defend it, no matter how dysfunctional.
• only use the lowest level langauge you can, it's more powerful/ faster (compiled, statically typed, manual memory management)
• only use the highest level language you can, it's more productive/ expressive (dynamically typed, GC , compiled or interpreted)
• only use standard library data structures and well established libraries, don't reinvent the wheel/ use good black boxes.
• roll all your own tools and libraries, you can't always trust a black box.
• use OOP, RAII / ARC, design patterns, embrace the standard, clean code and terrible performance
• use FP and hate OOP, state complexity is the root of all evil and parallelism is free.
• use CPU architecture oriented/ cache friendly imperative programming/ data oriented design and hate everything

Discrete tools in a continuous problem space