If this happened as described (and I have no reason to doubt that it did), it seems that this person has crossed the line. While I don't, personally, think this is at the level of "inappropriate touching" or "fondling," it's still over-the-line behavior.

This is, absolutely, a matter to be raised immediately to the manager on duty.

As for your issue on online credit card use...

Personally, I think your fears are misplaced. What makes you think that when you slip your credit card into the little slot that your information is safe? Ever HAND your card to someone?

If you've ever given your card to a waiter, who took the card away, you're at risk. As much as purchasing online.

And, given that you have no liability for fraudulent use of your card, you have little to worry about. Unless you're also revealing your SSN or something else that would lead to identity theft, you're fine.

Don't worry about it. Shop online.