In Guangdong province their native tongue is Cantonese and the people would prefer to speak their native tongue and dialect in socialable hours. In business or school they must speak Mandarin. Learning Mandarin will take you far and all around China. If your learning Cantonese your speaking their native tongue and will be able to understand what they are talking about in Socialable times. Learn on your own. If you make the effort you can learn it. There are lot of materials online to download or checking in the bookshops.