One person certainly was not happy with the way Kevin Pietersen handled things upon being left out of England's squad for the Pakistan ODI series. That was the England national selector, Geoff Miller.

Miller spoke immediately after the England team announcement when asked about KP posting his disappointment on Twitter even before the announcement was made.
This is what Miller had to say of the former England captain, "I don't think it is necessary. I don't like that kind of language and I don't use that language at all.
"I'm still the national selector and what I do is select sides with my co-selectors that we think is right for England. My priority is the England side and it is not about individuals.
"I'll talk to KP. Whether there is an apology or not I'm sure Andy Flower (the England coach) will have a word with him.
"This won't stop me talking to Kevin Pietersen and if he wants to apologise or thinks there is a need to apologise then so be it, I will certainly explain to him what my feelings are. It is something I could do without.
"I'll be watching games that he is participating in before the end of the season."
Careful, KP.
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