Soak the shrimp in buttermilk for at least 30 minutes in the refrigerator.
Prepare the seasoned flour mixture by combining all-purpose flour with paprika, garlic powder, onion powder, cayenne pepper, salt, and black pepper.
Dredge the shrimp in the seasoned flour mixture, shaking off any excess flour.
Coat the shrimp with panko breadcrumbs after dipping them back into the buttermilk.
Fry the shrimp in hot oil for about 2-3 minutes on each side until golden brown.
Whisk together mayonnaise, sweet chili sauce, and sriracha to make the bang bang sauce.
Assemble the tacos by placing shredded cabbage, fried shrimp, bang bang sauce, and avocado slices on tortillas.