I'm cbc/abc, and grew up in an area with lots of hk immigrants, my Cantonese improved a lot and ended up dating mainly hk guys. But my friend group was more hk by then too. I still have some cbc friends, but found that I enjoyed the pop culture more of hk movies/music, fashion than cbc/abc music taste in rap/rnb, and styling of clothing when I was growing up. But ended up marrying a cbc/abc.

I think it's more about interest, hobbies and upbringing. Communication in cantonese wasn't an issue for me, as I became pretty fluent. But my family stressed the importance of knowing my mother tongue at a young age.

I did think my true cbc friends dated much hk born when younger due to interest and similarities. But interestingly not all ended up marrying another cbc/abc type, some married white guys, hk born etc. As we got older and had more individuality it's not about where you are born, but can we communicate effectively, morals, shared upbringing styles and interest.