In TVB's plays, some Hong Kong people speak standard Cantonese clearly, while others don't. Is it a personal habit?

Many people speak Cantonese, Hong Kong Cantonese is very pleasant to listen to, just like Cantonese songs we often listen to, while Guangzhou Cantonese is terrible, and people who don't know Cantonese can't understand it at all.

Besides, Hong Kong people are very nice. Even if they don't speak Mandarin and know that you are a tourist, they will slow down and speak in Cantonese to make you understand as much as possible.

Really, Hong Kong people are very nice.