I don't believe in hitting them, but I'm not against a bop on the nose if nothing else is working. Though with Luna we are trying different approaches to things to avoid physically touching.
However, I know with the jumping and nipping at my daughter, we tried, stern no, removal, treats, and nothing worked, completely ignored us, after my mom swatted her nose, when she gets rough with our daughter all we say is easy now and she walks away. Now I'm not going to use nose bopping for everything just because it seemed to work in this case, but it didn't hurt her, she still loves my mom, and the behavior had settled some.