@ Ginger. How to explain...(yes trying to explain my thoughts in words others can understand is is where i really REALLY suck) I dont hold Pinkie to one standard and all the others to another, I judge each character (not just pony but all) based on that character itself, and what I judge for most is consistency, that the ponies (characters is to long to type and I always need to spell check it) actions stay consistent with there previously displayed personality. As long as the ponies actions are consistent with what one either knows or can infer based on setting/story/etc... I can deal with it. Or if not strictly consistent at least done using logic I can understand for WHY they did something inconsistent.
The thing is, most characters all have a good deal of the same base assumptions one can make on there personality based on the setting, I.E. most ponies could be assumed to have this or that behavioral trait just on the basis of being ponies, or for being in X genre of story etc... That's where having to use different standards for Pinkie comes in, all other ponies operate under the narrative rules of MLP:FIM alone, Pinkie however does not.
Now, I believe the main reason it doesn't really bother me, is that while Pinkie is not operating under the same base rule set of the rest, is that she's still operating under a specific pre-made rule set I'm aware of and can understand (mostly) namely Looney Toon's rules.
Point I'm trying to convey (probably badly) is that as long as Pinkie consistently operates under a set of rules I can understand the logic behind, I'm fine with it. And yes I can see how having one and only one pony acting under completely different narrative laws then the rest can be a bit off putting.
Build a fool proof system, and the world will create a better fool.