It is extremely ironic. I find it surprising (and not) that no one came to put him in line, especially since so many other members have been quick to do that to others in sometimes unnecessary circumstances in the past.
Nature will teach him the lessons that he needs to learn anyway. At least the true colors have been shown by that user

Look, we are in an internet forum and don't know each other personally. Our texts represent who we are. Someone could be a very good person in real life, but due to some misunderstanding, the community may think he is a terrible person. So, we should be careful with our screen and think about what we writing. Someone might have a different point of view. But, they should not insult others until their opinion is very unpopular or harms others.
I was surprised how he reacted to OP's post even though there was nothing offensive in the OP. He just called out OP as Joker, and then he also reacted to your post when you said "Shame on you". If you cannot take criticism, you are unlikely to learn. I would suggest he should recognize that he is a human being and he might make some mistakes, too.