Place tomato slices in a large bowl; cover with hot water. Let stand 15 minutes. Drain and pat dry with paper towels. Combine milk and egg whites, stirring with a whisk. Combine cornmeal, salt, and pepper in a shallow dish, stirring with a whisk. Dip each tomato slice in milk mixture; dredge in cornmeal mixture. Return tomato slices, one at a time, to milk mixture; dredge in cornmeal mixture.
Heat 1 tablespoon oil in a large nonstick skillet over medium-high heat. Add half of tomato slices; cook 4 minutes on each side or until crisp and golden. Repeat procedure with remaining oil and tomato slices.
Combine mayonnaise, juice, and hot sauce, stirring with a whisk. Spread about 1 tablespoon mayonnaise mixture onto each bread slice; top with 1 lettuce leaf, 3 bacon pieces, and 2 tomato slices. Sprinkle each sandwich with 1 teaspoon chives. Serve immediately.