One. Nobody knows but the person in question. Two. Most of these questions use truly arbitrary reasons to try and justify them liking them. ( He smiled, she looked at me, he gave me his pencil, etc. Three. Most of these questions remind me of 5th grade romsnce.
Because they're basic and obvious. A lot of times, question asker is also just reading WAYYYYY too far into things. As people do when they like someone and are hopeful and curious about someone, maybe, liking them in return.
Also, it's usually pretty freakin' obvious if someone likes you because they'll put in the effort and the effort will be noticeable. So it's a waste of space to ask a question about it when you can just sit back and reflect on how much effort that person seems to be putting towards their friendship, etc. with you.
I started off answering them, it was strange that people wouldn't know basic body language and I thought I'd try and help one or two folks. Now I've been for a month I've virtually given up since i've realised it's never ending lol.
Let us avoid the question of the question we want to avoid
They're hated because so many of them are blatantly obvious, to the point that if every time a guy/girl smiles at you, a question is posted on GaG asking if this sign of basic human decency means that they're in love with you, this site would become an even bigger waste of time.
Some people just write really stupid questions. Also, some are super obvious. Like, I know people can be clueless, but some of these questions are just looking for validation. Sometimes you just gotta trust your gut. I've asked questions like these, but some of them were because of really contradicting and complicated happenings that made me question things.