You're missing the point spectactularly. Words do not exist in groups of "These are always ok to say" and "Never say these", their meaning depends entirely on context. You should be aware of this considering the main derogatory term for African Americans and other black people is also used as a synonym for "brother" depending on the context it is said. If you're saying that Jewish people should phase out this word because some people use it in a negative way, that's a flawed argument, it's akin to saying we should ban anything that can be used a weapon - meaningless considering anything can be used as a weapon.

Rather than trying to convince people that certain words are always ok or not ok to use, you should give reasons for others to reconsider their usage of the word and prompt them to think of the context before using the word. Then you let them make the choice of when to use it.