Depends on what you mean by "insult." There is a difference between being openly critical of harmful or counterproductive liberal behavior, and using a term purely to express contempt. Both could be could be viewed as insulting to the recipient, but one can be constructive while the other tends to mostly be destructive.
There is also a difference between an "anarcho-curious" liberal as you put it, and a staunch, unflinching, liberal whose political identity is intrinsically linked to protecting the systemic institutions that anarchists struggle against.
