Aromatics account for about 90% of pipe tobaccos sold, so the dislike is not universal, by any means. This forum represents a tiny portion of the pipe smoking population.
It might be a snob thing, as some have suggested. It might be an authentic dislike for flavored tobaccos. It might be a level of ignorance about the diversity of aromatics available, a perception that "aromatic" is synonymous with cherry blends that taste like cough syrup, or "goopers" as some call aromatics. The reality is that many popular blends touted here could be defined as aromatic, like Capstan, which has a noticeable topping, but isn't defined as such because it's not so heavily topped that the tobaccos are subsumed by the topping.
Personally, I quite like some aromatics, like St Bruno, and really don't care what anyone thinks about it. I'm also fond of many of the G&H "scented" blends, with flavorings like rose geranium, or licorice, tonquin bean and other flavorings. And much of the vehemently pursued Esoterica blends are aromatics, or semi aromatics, with various fruit flavorings. Stonehaven has treacle. Other popular blends have maple, chocolate, and other flavorings.
Some of your respondents might be smoking aros without realizing that they're smoking aros because they have a limited definition regarding what an aromatic is. Oh, and to muddy the waters a little more, once upon a time, ALL English blends were referred to as aromatics, because they used Latakia and various oriental leaf.