You can slander me anytime you want Symph
But seriously, the person in question really needs to take a step back and realize the compliment of the word "charm" as you are using it. Sure it can be used in a bad way but as far as I can see you are using it in the positive way which is 100% cool in my book...
And on a legal side note: Nothing about critique is slander unless you are stating lies as facts which clearly no one is doing according to *now I start making up law numbers* section 4 of the Free Speech doctrine paragraph 15 sub section 8 line 4 letters 1 to 8 which spell "Gief Hugz"
That is all
Jonathan