In all honesty, I don't have a real issue with it because, first, whatever opinion of that kid regarding other people does not reflect my own, he does not represent me, I represent myself, second, he's his own moral arbiter, not me, whatever he does, is his business, as long as he does not say I'm actively urging people to bash the person he has a quarrel with, he can do whatever the hell he wants.
In any case, if there is a misundersanding the person who blocked or any of his/her friends him can simply send me a PM which I gladly answer to clarify the things I mentioned above.
The only reasonable thing I can do is to comment on his picture clarifying that his opinion is not mine and vice-versa. Thank you very much for your concern, I appreciate it. Peace.