You can think of low-class as one word doing one thing: it takes something and puts it near the bottom of a scale. English class is used for two scales at once — the layers of society, and the grades of quality. Low simply points at the bottom layer of whichever scale is in view. Either way the speaker is standing above the thing and looking down at it, so the word almost never sounds neutral.
「low-class」可以想成一個動作：把某個東西放到一把尺的最下面。英文的 class 剛好同時是兩把尺——社會的階層，和東西的等級。low 就是指向這把尺的底端。不管指的是人還是東西，說話的人都站在上面往下看，所以這個字幾乎不會是中性的。
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