As an American pilot who conducts most of their flights outside the US, I agree, the phraseology standard of most of my colleagues is downright embarrassing. Indeed, it seems that many US pilots go out of their way to be non-standard and I find it absolutely maddening.
They do things like omit their flight number in readbacks, other times say only the flight number and omit the callsign, they add a possesive 's to the end of their callsin, say "checkin' on with ya" on intial callup, say "up to three four oh" when cleared to climb, say "down to two seven oh" when cleared to descend, and otherwise just break into random sentences of non-standard English when doing something as simple as asking for a weather deviation. It is very frustrating to be an unwilling accomplice to this behavior.
Unfortunately there is no way to address this issue without coming off as a complete
. I've found that pilots take these types of criticisms personally, especially if they come from a relatively junior pilot such as myself. I have little choice but to keep my distaste internalized. All I can do is strive to be standard when it is my turn to key the mic.