You've really only covered two points - why corporate customers won't RTFW and why they ask for discounts. If you are dealing with a corporation you might get contacted multiple times through multiple channels, but probably not from the same person in a short period of time.
Disrespectful and abrupt communications are still a warning sign for larger companies as are unrealistic expectations (at least for the example given).
The article specifically mentions that "Any one of these warning signs is not a big deal, but stack 2 or 3 on top of each other and (depending on their severity) you have yourself a red flag." A corporation might only set off 1 or 2, and if you keep in mind the points you made I don't think it will generate too many false positives.
The tactless tosser in purchasing that quite possibly has been told to get some pricing options by his management by the end of the day really shouldn't cloud your judgement of the entire institution.
Even in the example blog, the problem person was eventually bypassed and the sale went ahead.
If one finds oneself in this situation is there any general advice for trying to get to talk to someone else if you contacted by a jerk from what might otherwise be a good prospect?
Disrespectful and abrupt communications are still a warning sign for larger companies as are unrealistic expectations (at least for the example given).
The article specifically mentions that "Any one of these warning signs is not a big deal, but stack 2 or 3 on top of each other and (depending on their severity) you have yourself a red flag." A corporation might only set off 1 or 2, and if you keep in mind the points you made I don't think it will generate too many false positives.