derogatory

showing strong disapproval and not showing respect วิจารณ์ไปในทางที่ไม่ดี, ดูถูก, ตำหนิ

The posted message made derogatory remarks about the premier's intelligence and sexual morality.

I vividly recall a wealthy land broker in our village shooing me away from her front porch by throwing a bucket of water, calling me all sorts of derogatory names to shame my family.

I believe I am familiar enough with the language to know that "farang" is not overtly derogatory -- but it can be if need be.