Also 3 of the biggest unc basketball fans I know pull for different teams in football. My cousin pulls for unc basketball but South Carolina in football since his brother played TE there. My neighbor graduated from unc but pulls for WVU football because her husband graduated from there and my best friend pulls for heels basketball but NC State football because his brother went to NCSU.
Your best friend sounds like an idiot. Also, you shouldn't value a woman's opinion on sports.
A majority of my friends are Duke fans. Like an overwhelming amount. I have a few big carolina fans like myself but when it comes to ACC basketball time, Duke fans have us out numbered at least 3:1.
When football season rolls around, lol, it's a different story. My room mate went to ECU with me, I've known this guy 15 years and this is the first time I've ever seen him show ANY interest in Duke FB. He worships duke basketball. He'd probably give Seth Curry a handjob if he asked nicely.
There are dumbasses in every fan base. Like your friend. Like a few folks in this thread. But as I've stated before man, Duke fans are basketball fans. period. They had a little spike in football interest this year but next year it will be back to normal. 3 wins TOPS.