Eh.. Kinky and Kinky Curly just describes very tightly coiled hair to me and I don't neccessarily see it as an automatic insult. Kinky hair isn't always "curly". I think some people associate it (the term Kinky) with negativity because some people feel it's synonymous with "nappy" which is often seen as negative. I personally refer to certain hair typesr as kinky and I definitely don't mean it as any insult.
For me personally, I think it really depends on how it's said and why.