Nah. It's more of a general allegory encompassing all forms of minority groups and social outcasts. Different writers and editors choose which ones to highlight. For example, while the original Lee, Kirby 60s run--and Chris Claremont during the 70s--might have emphasized disabilities, through numerous stories like Days of Future Past, God Loves Man Kills, and New Mutants #45, Claremont during the 80s prioritized race and sexual orientation.