When you feel compelled to defend yourself as a serious writer, even though you write romances (but they have WORTHY!!! themes and none of that erotic trash), while simultaneously denigrating people who write erotic romances and erotica, and you don't realize how hypocritical you're being. The person who did this made me want to snort with amusement. The irony.
My view is if your writing entertains someone, it's as valid as anyone else's. My personal preference is I would rather read a well-crafted romance, erom, or erotica than one of the bastions of literature, such as Hemingway. (Have you read "The Old Man and The Sea"? He takes a long boat ride, catches a fish, loses fish to other fish, and that's about it. The End) For me, there is more value in a smutty (I mean that in a good way) romance novel by Marysol James than John Steinbeck. That doesn't mean I don't think the great writers were great. They worked hard, I'm sure, and some people love them. I'm just not their target.
So, authors, don't get so defensive, regardless of your genre. The people who want to read you will find you. The people who aren't your demographic will steer clear. They might mock you too, but develop a thick skin. You're going to need it in the publishing biz.