Triggers allergies. There is a huge amount of evidence about most health claims like cancer, though there's also a lot of evidence against, so I won't comment. However, I'd argue that environmental damage is also 'bad for you' in the long run. GMOs are not the solution to world hunger - I recall reading that they no longer raise yields any more anyway.
GMOS CAUSE AUTISM
We're messing with nature.
Stop f*cking with nature. Just stop.
This is... All wrong. ONE type of modification may be "bad". I know what you are asking, and the reason for the "no" answer is, this is sticking our heads in the sand. By itself, it is nether good or bad.
Some gmo strains are bad because they aren't approved in other countries in the world. Other strains have been shown to be safe. The issue is if an individual who has confirmed celiac disease eats a product that may contain gmos they can get flare ups.