Luckily there are different versions of Big Brother. UK, Australia, and Canada to name a few. All of them have rules against racism and homophobia, so the same issues won't crop up there.
Canada's first season was last year, and they had a really nice thing: A lot of their players were older than reality TV show norm (annoyingly, most people on reality shows are in their 20s). Unfortunately this year seems to be tending towards younger people, but I have hope that Canada will go older again in future seasons.
If you'd like to check out BB Canada, the first ep of the second season is online for free. The previous season is around to download too, if you're interested.