most parents don’t like there children talking in slang because most children wasn’t brought up talking in that way but have picked it up maybe of friends or out and about like going to play football at a local pitch or at the park and handful of more places.
people sometimes thing a lot of the slang words are bad to say.
slang sometimes makes somethings good like when someone is texting you and you want it to be short you may use short slang like lol or g2g and more because if you wanted to write a full paragraph you may just want to be short with it and do that other than write the whole thing