Calling a paedophile (someone sexually attracted to children) a paedophile, is calling the disorder by its name. It’s not ad hominem in any manner.

But the fact that you can’t seem to differentiate between a paedophile (a person afflicted by a disorder they usually do NOT want, someone who deserves appropriate psychiatric help), and a child rapist (someone who has raped a child, and deserves no empathy, but appropriate steps to ensure they never harm a child) is quite telling.