Some with negatives
Some with negatives.
- I don't want some guy coming in here and asking me questions.
- I don't want any guy coming in here and asking me questions.
Number 1, I know I have this before. Number 2 sounds unnatural. Though I can recall hearing something like this, "I don't want just any guy coming in here off the streets and asking us questions." I know there is written grammar that we mainly use any with negative statements, however, there is little detail in the written grammar I can find about using some in negative statements. What does this community think are the rules for using some in negative statements?
Also, has this aspect of the grammar just been overlooked because it is inconvenient to explain? Or to avoid confusing the beginner?
Some other examples from Ludwig (excellent site for finding authentic language!): https://ludwig.guru/s/don't+want+some https://ludwig.guru/s/not+some https://ludwig.guru/s/not+some+small
Some guy is used (informally) in the sense of 'any unidentified man'. This is not the same usage as I want some porridge, which in the negative would become I don't want any porridge.
You are right that I don't want any guy coming in here is not particularly idiomatic; it would be more natural to use anyone. Just any guy could also be used, with the same sense as some guy - a random person not known to the speaker.