I have heard those jokes before. I believe most of the statements are true for how all humanity should live. I mean there are the Noahide laws. It shows us how to treat each other. I know you disagree but reading the life of Yeshua, but it shows us a lot about how to treat one another. He is moved by empathy and compassion, do not worry about tomorrow, turn the other cheek, treat others as yourself etc.They all used as a basis for how Jews should live and have specific context and meaning.
Some apply to general laws for living, some ceremonial, some court judgements, and some just laws with no apparent rational basis for them like the laws concerning the red heifer and cleansing from the dead.
Keep in mind, in general it is joked 2 Jews 3 opinions. Even within Orthodoxy, they are many flavors of Jews.
There's another joke about a Jew stranded on an island. He built 2 synagogues. One he wouldn't attend and one that he did. So, even within close circles, there are strong opinions and disagreements. Even the greatest Rabbi's disagreed.
I was surprised when doing the Jewish studies because of an attitude that some had in the class. I mean the Tanakh is very clear on how to treat each other when we do business dealings, we are to be fair. There was a case at the time of a real estate deal where a person was well and truly ripped off by what I would call poor ethics in a deal. Some in the course said it was okay it was just business, but others agreed with me that we are meant to be fair in our dealings. So yes different opinions.
The behaviour shown by Yeshua are in the Tanakh as well. It would be great if we all followed the greatest commandment, it would be a major difference in how we treat one another. I do not understand why their is a need in some people to harm or hurt others.