It all comes down to these three things:

1)  Shitposters write poorly-written posts.  This is usually, but not always, because the shitposter is trying to write in English when they have a very poor grasp of grammar, what words should be capitalized, where the punctuation should go, and shitposters tend to very often have an extremely limited vocabulary.  The person might be intelligent in his or her native language, but posts often sound like they were written by a simpleton.

2)  Shitposters produce vapid content.  Shitposters usually don't have much to say.  When they write something, it has usually been written many times before by many different shitposters.  This leads to either very short, boring posts or very bloated posts that should be much more succinct than they are.

3)  Shitposters are incentivized to post.  This is obvious if you're here for longer than a week, and this is also why people don't read anything here--shitposters are not paid to read.  It's why most posts you make don't get replied to in the spam mega sections like Bitcoin/Altcoin Discussion, Economics, and Speculation.  This also explains why there are so many members here and why there's so many posts in general.

If you see a post that you think is complete crap, it's almost a guarantee the member will meet all 3 of these criteria.  And OP, you're going on ignore.