“Oh, you have rosacea–let me steer you to the natural/probiotic/hypoallergenic range”

I am looking for a good foundation.  Because I have sensitive skin, I will need to cast a wide net to find a product that agrees with me.  I don’t want to limit myself to only certain brands.  But when I go in Sephora, I sometimes have a hard time getting them to match me in a foundation that isn’t considered either “natural” or “hypoallergenic.”  Am I mistaken, or are “natural” and “hypoallergenic” really marketing terms that are not useful?  And any tips on arguing them out of only showing me bare minerals or Clinique products much appreciated.  Aaargh.