somebody who hates to be touched, not because of germs but for other psychological reasons.

And it's further validated by a chapter in this book I'm reading now called Blood and Oil: Mohammed Bin Salman's Ruthless Quest for Global Power about the preparation for Trump's visit to Saudi Arabia.

All the planning is only about how not to get Trump into a situation where he might look foolish, and the secondary concern is that he not be touched by a stranger. SA wanted to present him with a medal and a major concern was would he allow someone to put it around his neck. They finally reached a compromise where the medal could be put around his neck but that he wouldn't bow his head.

Not a word about avoiding germs, etc...

Germaphobia is an excuse he's used when needed to avoid touching or being touched, especially by people he doesn't know, or just generally to avoid situations that make him anxious.