I'm always sceptical of anyone who mentions 9+" long cocks without also mentioning; a) how rare they are, and b) that girth is just as, if not more, significant when discussing if cock size is likely to cause a problem.
Casually indicating that a 10" long cock is not very desirable without acknowledging that it is unlikely most women will ever encounter one demonstrates ignorance. Or, they are exaggerating their own experience to the point of silliness.
Likewise, in my experience, a really thick cock is just as likely to cause the problems this woman is alluding to. I have been refused a repeat performance, restricted in what positions we can do and asked to put it in only half way, etc. Do you think that is because my cock is 7.5" long, or because it is 6.5" girth?
I'm not buying this.