Well you have to see couple of things here. MC is more of a Miyagi-Do than Cobra Kai
. He even have this unspoken code that He only use his skills to Self defense, HE even mention that he break this code when he fought with the Jocks. but even putting this aside, MC does not seem to be the person who actively would try to harm someone. I don't think he is fight with the mentality of I'm gonna break your arm, you gonna split blood etc etc.and an another thing, is that almost all of his Fight was interrupted somehow. The ones that were not interrupted, He clearly won.
I honestly I don't have blood fetish, I don't care about it, but its not bother me if there is not. The bitches are more important anyway