Posi needed!! Please help

I don't understand why people hassle folks about calling a limited slip or sure gipr posi- let it go- It is a generic term that has always been used - not just for GM cars
exactly- do the guys that complain about 'posi' ever call use the words 'kleenex', 'bandaid', 'aspirin', 'thermos', etc, when actually using something made by someone else? Probably.