ITU/ICAO/NATO all the same, and for a reason. The guys who use other words are usually trying to set themselves apart from the crowd, sort of like a peacock. Same as the guys on crystal clear FM or digital who insist on using Q codes, cop talk, or all of the CB slang phonetics. I hear them say "agh" and "um" a lot too. Oh well, it's a hobby.
They aren't usually very successful in pile ups, field day, contesting, or EMCOMM.
removes spoon from pot
Not everyone who uses phonetics other than NATO does so to draw attention to themselves. You should consider that different hams will have different backgrounds than yours.
I dispatched for a large police department in Florida that uses phonetics largely based from the LAPD. Lots of the older hams in my area are veterans and of course... use the phonetics they learned while serving.
Point being... old habits are hard to break. Not to say standardization isn't needed in amateur radio but these older phonetics will phase out with time. No need to make accusations due to ignorance.