This is merely an exercise in linguistic accuracy, not an exercise in political correctness.
That said, it annoys me to no end that "abnormal" has become a dirty word. Normality is simply what is considered average. If you fall outside of the average, you are abnormal. Simple enough.
I say this as an immensely abnormal person. The difference is that instead of flinching away from the term, I embrace it. I take pride in the fact that I am different. Uniformity is bland and uninteresting. Variety is the spice of life. All that jazz.
I think treating "abnormal" as a negative epithet just gives power to those who are intolerant of differences. We allow their insult to hurt us when we should be subverting it to work against them.
When the British mocked the Colonial Americans by calling them Yankees, laughing at them for being less "refined" and "cultured", the Americans threw it in their face by turning it into a term of endearment, taking pride in their differences. If "normal" people mock others for being different, I for one would prefer to see their victims rally behind the label of "abnormal", defying their abusors and taking pride in who and what they are instead of being ashamed of it.