I truly am going to stick to my word and ignore the rest of your commentary about Python: there is a long thread with a lot of context started by an article that is at least attempting to disagree with your premise; the things you are asking me to explain are thereby all "assumed state" for this tiny sub-part of the conversation, so you can take up your issues with someone up-thread who might feel less insulted by the overall direction of the argument you are making.
However, I will defend my wording, as I think that is unrelated: the phrase "once you get it into your head that" (even with that direct "you", rephrased from "people get the idea into their heads", about others) is a statement about the virility of the idea that someone now believes; in contrast, "get this into your head" is a direct command given to a person used to indicate that they are being dense and thereby are unable (or unwilling) to understand the idea in question.
To make this distinction more clear, you can look at something generally considered positive: "once saurik gets it into his head that something should be built, he builds it" or "people get the idea in their heads that things should be built, and then they actually build them" are both fine; "get this into your head: once you determine something should be built, you should actually build it" is both harsh and patronizing: it is an entirely different concept for the sentence, used as an attack.
As someone who started this sub-thread I have to say I read it with pleasure: it is informative and broad, I learned some from it, and I wanted to thank you, saurik, for your input and perspective, even though I don't fully agree. I have nothing to say ad rem, at least nothing that wasn't said already, but I wanted to comment on that unfortunate phrase. As I see it, there was no malicious, "harsh and patronizing" intent behind it; I agree that it was not particularly polite, but I feel it wasn't very brutal an attack either. So please, don't hold it against your adversary (or, God forbid, Python community) or at least please try to not be offended - I'm almost 100% sure it wasn't meant to be offensive in the first place.
However, I will defend my wording, as I think that is unrelated: the phrase "once you get it into your head that" (even with that direct "you", rephrased from "people get the idea into their heads", about others) is a statement about the virility of the idea that someone now believes; in contrast, "get this into your head" is a direct command given to a person used to indicate that they are being dense and thereby are unable (or unwilling) to understand the idea in question.
To make this distinction more clear, you can look at something generally considered positive: "once saurik gets it into his head that something should be built, he builds it" or "people get the idea in their heads that things should be built, and then they actually build them" are both fine; "get this into your head: once you determine something should be built, you should actually build it" is both harsh and patronizing: it is an entirely different concept for the sentence, used as an attack.