I kind of ran into that a little bit during my last trip to my local BSS. I was looking for some hair for a sew-in and I kept being approached by women with snotty attitudes who wanted to know why I was buying hair when I have a lot of hair already (my hair was down). I felt like I had to justify my desire to wear a sew-in as a protective style and it was annoying.
Then, in the same visit, I was approached by a woman with what appeared to be damaged and dry hair and she asked me what I used on my hair. I told her that I really like the ORS products. I asked her how often she cleansed and moisturized her hair and I got the "well, you know our hair gotta stay dirty" comment...
I was done. I just let her buy her Blue Magic and MBL phony pony and I kept it moving.