"Yes, languages are categorized based on their difficulty for native English speakers. The Foreign Service Institute (FSI) ranks languages into five categories, from easiest (Category I) to hardest (Category V), based on the estimated time required to achieve proficiency" Mandarin is Category 5
Mandarin is 10x harder than english, english was seen as more of a base world language for some countries. so they don't really get excited when someone speaks perfect english.
