The key point in those articles was, to me, this:
I am not a Jew. As a gentile, to know what is offensive I have to seek guidance on what offends Jews and that has to involve consulting those authorities that Jews, in general, choose to speak for them. If the WJC and BOD say that it is offensive to use these terms (and the other behaviour described), that that should be good enough for all of us, Jew and Gentile alike. Nothing that anyone says will make it less offensive to, at least, some Jews. It cannot be justified on the basis that you can appropriate someone else's identity because non-Jews have no right to do that and cannot be given a right by proxy, so to speak. The use of the word is offensive. So we have to conclude that they are happy to condone offensive behaviour and that, by not acting, the relevant authorities (the FA, the Police, the CPS) collude in it.
Worse, it legitimises the use of abusive terms. Let's say we (as CFC fans) decided to use the word "rentboy" as a badge - to appropriate it to describe ourselves. By doing that, we are legitimising the use of the term in our own circles despite it being offensive to some. And we create an environment where people outside can argue that they can use the term because we do. More, we back those in our group that it offends into a corner because it means that they have to accept the use of the term if they want to be included in the group. I wonder how many Jews among Spurs fans would prefer that the term were no longer used but feel they have to stay silent on the subject.