That's just stupid. We're not talking about "users" here, we're talking about "engineers". If you can't grasp the complexity of Git, you've no business using it. You need to be working in an environment with a centralised VCS and somebody administering it.
Unless you mean just VCS for yourself, in which case you could probably just use anything you liked rather than complaining about it ...
And it's not manliness to say that if you can't grasp complexity you really shouldn't be writing code. That's self evident. It's the whole point of what we do. I'm not looking down on people who can't code - but it's horses for courses. To suggest anything else is just bonkers.
You could have read their comment as saying that they have things they'd rather be doing than learning Git. Instead you took the position that expressing a desire for nice tools is a sign of their total incompetence at programming, that they are complaining because they cannot grasp its complexity (despite them saying "I can use Git" which suggests they can grasp its complexity). You dismissed "The Git UI directly models the Git internal model and that's just bad design", launching straight into calling them stupid and saying they need handholding, for merely wanting good design - because good design makes things easier to use, and things being easier to use is for stupid people.
You could have argued that Git is easy to use and therefore they are stupid for not being able to use it. Or that the interface modelling the internal workings is a good design. Or that Git's complexity is necessary and no simpler interface is possible. Instead you agree that it is complex and thrill about the complexity and use it as a showoff point about how it makes you superior. That's the manliness part. Not as you willfully misrepresent it "if you can't grasp complexity you really shouldn't be writing code" but "if you don't want to spend your life on the complexity of a supporting tool unrelated to the problem you really want to solve you really shouldn't be writing code".
Git is a tool in support of programming, learning Git is not the whole point. Programming involves dealing with complexity (often in the sense of simplifying complexity and hiding it away), but that doesn't mean everything has to be complex to use, and it doesn't mean that someone has to enjoy the complexity in everything to be a good programmer.
