Among many Western artists, punctuating their speech with curses, is a "cool" thing to do especially among the hip hop groups or rappers who have developed a sub-culture with their own linguistic style & patterns...which interestingly, have also made the genre more unique & well-defined... they speak like that even when they're not making music or rap...
About Rm...haha, that was a good & keen observation you made about how he "tried" to do some British accent with Cord3n...the inflection came at the last part when he made that falling intonation in the last 2 syllables... lol.
As for T*e, it's very possible that he's experienced trauma before age 7... There are not a lot of data coming from T*e's personal life...but the more publicized info that his grandma was the one who raised him speaks so much about his nuclear family...to be taken cared of not by your own parents, suggest a whole lot of other issues besides economics...
Surprisingly, despite his "erratic" behaviors, I still find T*e to be the most "authentic" of them all...