The two sides fallacy:

I believe that whenever two groups come into conflict, especially when there is a powerful differential, this will happen. Let's imagine that crocheters post fifty threads per day on the etsy forums about how jewelers suck- they post too much, their stuff isn't really handmade because they just put storebought stuff together, everyone posts jewelry, and the jewelers post five threads per day about how fruit doesn't need cozies, and how nobody needs that many knitted items anyway. In discussing this, someone will say something about 'it goes both ways' or 'it's on both sides', completely ignoring the difference in volume between the two. Add a power differential, and well...that happens super often. urgh.