I've found many more black men on average that just flat won't eat pussy, like before we've even met or on the first meeting say they don't do it. But I've also been out with many more black men so it's not a fair sample size lol
Personally I won't date men who don't eat pussy since that's taking such a huge thing off the table. I find men who eat pussy and love doing it are better lovers overall.
To address the original question, I'm not a size queen, not into race play and don't treat my partners like sex props so I have no interest in all the bbc bullshit. The size of someone's dick isn't even on my list of important things in a partner beyond it not being excessively large or small to the point where sex is impractical and even that is far down the list in terms of importance.
It's a harmful stereotype that makes average black men feel less than and in a lot of cases, especially with younger guys, if they are packing it tends to consume their personality to the point where they come off as one dimensional. As
@blackdickwitht said there are also a ton of guys with an average dick but advertising themselves as otherwise, which can cause a lot of disappointment on both sides when they come across a size queen expecting them to whip out a monster. It's just problematic all around for the most part.