I questionned him calling you that Fabi (not cool even this risque jokes inviroment, out of the blue)), and was suprised you were "ok" with it (due to your lack of reaction and silence) and assumed it was some weird inside joke despite not seeing the jest side of it.
But to read the above, that you said you werent ok with it to him privately and for him to stop 20 days before (this is were it stopped being "harmless joke"), and he still continued? Thats were it became more then just a joke, to say the least, for him to ignore it and continue to insult you in that way, is clearly disrespectful. And if he continued it, not only as a mod, but as a poster, you were totally in the right to report it.
Seriously, what a dick move Burke. If someone behaves like that, they should be warned, and if its a mod, he shouldnt have it "suggested" to him to step down, but demoted. Simple as that.
P.S I defended Burke in bizzarely being compared to Seven, by saying what he says is in jest, for fun and does not really intend to insult (mostly), and that the comparison is hardly valid. But the above is simply nothing but a basic case of clearly and directly insulting someone else repeteadly (and as a mod to boot).