I have never blocked anyone and doubt I ever will. The only reason I can think of to do so is if someone spams me with notifications - something that has never happened but if it ever did I could just report them for spamming.
I have however been blocked by at least two users. In the first case after I was blocked we proceeded to ignore each other and go about our business until they were eventually perma banned from the site. This seemed to me the mature way of going about things.
The second case started just recently. After being blocked I assumed that this person did not want to hear from me anymore so out of respect for that wish I did not try to talk to them anymore, though I saw no reason to avoid talking to other people on threads that the person that blocked me had created. In one such thread the user that blocked me has attempted to strike up conversation with me several times by tagging me in posts but I have hesitated to respond.
I am worried that it would be rude of me to talk to them if they have blocked me because I thought that blocking meant you did not want to hear from that person. On the other hand I do not want to come off as the petty 'silent treatment' type either. That would be just as childish.
So since I have never encountered a situation like this my question is twofold. First, what is generally considered the proper etiquette for handling a situation where someone blocks you then tries to talk to you? Second, what if anything does the CoC say about communicating with someone that has expressed their disinterest in communication by blocking you?