Yes, many of these things are annoying, and many of them are from the USA.
The trouble, beso is that many people do not like to see their language bastardised. It�s not a question of them needing to �chill out� (which is a particular phrase I am not fond of).The idea of a language is such that everybody using it can understand what anybody else using it says or writes. The �dynamism� which you say exists is often simply ignorance or laziness, and eventually leads to parts of the language being comprehensible only to the small section of users who make the changes.
In many cases awkward ripostes sometimes have the desired effect. For example �Can I get a cup of coffee?� could be met with �No you cannot, I�ll get it for you�. After your order has been taken, you may be met with �You got it!� You might then enquire �Well if I have it, where is it?�
Just try to make life as difficult for those who you cannot understand or who use inappropriate phraseology, as they do for you. It�s much more satisfying than �chilling out� (whatever that might mean).