Not only is the left insane, they have no sense of aethetics (or linguistics).
"First-years" (used alike by grad programs and women's colleges) is perfectly fine, as is "freshers". "Freshmores" is not.
As to the lingistic problems "mores" in sophomores means "fools" so that sophomores are "wise fools", a description of the know-it-all attitude they often evince, and is from Greek. "Fresh" is from Anglo-Saxon and one does not paste particles from different languages together. "Neomores" meaning "new fools" might work. And then there's the fact that "man" and "men" originally were the equivalents of "anthropos" and "anthropoi" in Greek, not of "andras" and "andres". We male human beings lost our proper English word "wapman" (plural "wapmen") and got stuck with the generic. So freshmen are the new human beings at the school, firemen are human beings who put out fires, and the like.