Personally I think this is just plain rude in what's generally accepted as a dueling area. If you don't want to bow back for whatever reason that's fine, but why interrupt me while I'm trying to show you a little respect? Everyone's free to play the game however they like(it is just a game), but I can't understand the reason for this rudeness. It's childish and mindless, in my opinion.
So now, if someone kicks or hits me while I bow to them I just bsc out or jump of the ledge if I can't. I'm not going to reward players like this with souls, humanity, dragon scales, or most importantly a good fight.
(To be clear, invasions are a different matter. If I'm invading, the host didn't agree to have me in his world and can do whatever he can to get me out)