Well the first thing I would do is go to the Wikipedia list for offensive words in their language as a starting point. Construct some elementary sentences about having intercourse with their parents or something. Standard chirp material, but I want them to know I’m serious by taking the effort to learn their language. Then I’m gonna learn to construct more complex sentences - more abstract and local specific insults. Emphasis on abstract: if I can come up with some extremely specific hypotheticals, excessively weird comments related to things not appearance or family based, that will probably do more damage than anything else. Then once they get used to that, I start acting really gay, this doesn’t work on everybody but the people it works on it works VERY well. Then I bring back the parent intercourse jokes but with serious intent this time. Works like a charm.