You might try. "Look, suchandsuch, you know how I feel about touching. For me, it's one step down from sex, and it's one of the things you gave up when you gave me up."

If they're reasonable, it shouldn't be a problem. If they're not reasonable, it might just be one; You don't strike me as the type to make unreasonable friends, though.

Actually, the letter is a bit out of date at this point. Between writing the letter and getting a response, I gave up trying to talk with them. Too much effort for little-to-no reward.

Your hatred of unwarranted touching reminds me of my dignity obsession.

I won't even join one of those pie competitions that disallow the use of hands because I consider it undignified.
It's also the reason I refuse to cross-dress, regardless of how much i'm told I should.

I, on the other hand, have no shame. <:D

"Jack Sprat could eat no fat. His wife could eat no lean. And so betwixt the two of them, they licked the platter clean."