Completely ignoring the fact that empathy exists. You do realize that 2% of the population in the medical field is considered very common, yes?
2% of children and 0.5% of adults have a peanut allergy and that's so common that they have entire rules around in in public spaces.
0.24-1% of the population has Rheumatoid arthritis. That's an eighth to a half of the number of intersex people!
1-2% of people are estimated to have autism, and that's considered a common condition.
0.1%-2.6% of people will get melanoma in their life time, and that's considered common.
Completely ignoring statistics like 6% of women have PCOS (which is a condition that can fall under the intersex umbrella). 2% of the population in the medical field is considered a common condition, and ergo by medical terms intersex is in itself common.
So yeah. I think intersex is common enough to include in our discussions around gender and how transphobic rules affects intersex people.