There are plenty of terms that started out as one thing and were distorted over time to be derogatory towards a certain race or sex. Mary Sue is one of those.
"Mary-Sue
A sexist term used to enforce the misogynistic ideals that female characters/authors shouldn’t be allowed to fantasize or write anything along the lines of wish fulfillment. Its misogynistic qualities are exemplified in many ways, most notably being the fact that it’s not a term dominated by the male counterpart despite existing in a patriarchal society, as well as the fact that the male counterpart is largely undecided upon in name and also undefined (see urban dictionary’s Gary Stu entry which has no definition but to say “A Male Mary Sue”, and the Marty-Stu entry which involves the “Mary Sue” definition to define it).It’s usually used on the whole to bully new authors out of writing female characters altogether, making the task seem so daunting to some that they now only write slash fictions with two male characters, also exemplifying the misogynistic qualities this term involves."
You’re citing Urban Dictionary? Anyone can write absolutely anything on there and it remains forever. There is no oversight or rules whatsoever. If they tried to add that to Wikipedia it would quickly get deleted for being an NPOV violation, as well as having no citations. I could write an Urban Dictionary entry that says Mary Sue is the name of my plumber’s great-aunt.
The fact that Wesley Crusher was the most famous Mary Sue in mainstream fiction prior to Rey negates your assertions anyway (and negates the assertions of whoever wrote that Urban Dictionary entry).