My 12 yo uses 'bruh' alot and honestly I don't care. Couple other choices slang and curses. Hell all my kids got my penchant for swearing
For me tho, it's teaching her situational awareness. When we chopping it about nothing, they slang don't bother me. When shit hit the fan tho, gotta know how to turn that shit off and that's what I'm teaching them. A teacher can be keekeeing in ya face one minute and its all yuuurrppp's and on god but when it's time for bitness its yes and no ma'am/sir, right away, and controlling the sighs of annoyance
It's tedious and a chore but it's what parent hood is. Can't be mad at anyone if you don't wanna go all in for ya kid