The only ego at stake here seems to be your ERdoc. As I said, give it a rest. You have beat up this 14 YEAR OLD enough.
Even if you use the abbreviations, a 14 YEAR OLD will know what they mean when it comes to cursing.
I am still not so concerned about a 14 year old who wants to be an EMT and hasn't learned all the legalities of it as I am about someone who should know better than to go after a 14 year old on an EMT forum in the manner you have. If someone hears a 14 YEAR OLD make a statement about being an EMT, those are in his area might know he left off the "junior" or explorer part. I doubt if it warrants a cursing. But, if others were to over hear the conversation posted here directed at a 14 YEAR OLD, I would hope any responsible adult would intervene regardless of your patch.