fact: each person has her own reason(s) for buying what and where she does.
fact: unless she's asking somebody else to pay for it, she does not need to justify anything or accept any sort of personal label.
question: why assume that a person is a snob just because she insists on shopping only in high end shops? she may have a long list of reasons that have nothing to do with that. for example, she may "shop with her heart" and be motivated by a desire to support only small businesses. for example, she may need and/or appreciate the personal attention and value help selecting fabrics that will work best together. for example, she may have signed up for classes and feel it would be rude to buy her fabrics for those classes someplace else. for example, she may feel confident about her purchases only when she's been able to see and touch them in person beforehand. the list goes on and on. not everyone who shops only in the LQS does so because they are unwilling to believe that good fabric can be found elsewhere.
question: why assume that a person is anti-LQS just because they normally or always shop elsewhere? that list is pretty long as well.
do not prejudge. do not assume.
there is no need to be anti-anything. just be pro-whatever-your-preference-is an worry not about anybody else's preference. be happy for yourself. be happy for them.
look in a person's heart for who they are. you won't find that out by looking in her stash or at the price tags. ;-)