Rudeness passing onto child?

I know it is common that ADHD individuals are rude. Is a lack of politeness (usage of the magic words please, thank you, and you're welcome, separate from this?
    My soon to be ADHD ex husband has never used the "magic words". For instance, he came over this evening to drop something off for our son.  When I thanked him, he was looking right at me so I know he heard me.  However he completely ignored me.  Yesterday, he got my car unstuck and of course, I got no response whom I express my gratitude.  Not only is this rude and unprofessional, but my son is now doing the same thing. Anyone else experience this?