Still not getting how this is possible. The seats are on "steps" so each row is higher than the row in front of it. Unless he has arms/wrists/hands smaller than mine, I can't see how he could reach between the bottom of the seatback and the ledge in the next row. But I also don't know a single woman who puts her purse on the floor in the theater. Hanging on an arm rest, sitting in the sit to one side of her (BAD), or next to her in her own seat. Or, like me, my ID and funds are in my pocket and purse is locked in my vehicle or left at home.
All that said, no. I cringe to think of the bottoms of my shoes on the theater floor, much less any other part of my person, not even if I were attired in a haz-mat suit. Just ick.