I think I got hit on at church today

I got hit on at church today, or I think so.

There is this guy who is an extrovert type, who knows me at least a little, and today as I passed by, he placed a hand on the small of my back, and then tried to tickle me.

The good news is I didn't freak out, the bad news is I am not sure what my response should be next time I see him ...