Not for every individual item perhaps, but as an overall concept yes

I don't think you can automatically label every single GMO item as bad, but it is easy to label the concept of GMO as bad.  We have quite the track record of creating items which are not normally found in nature and the record is not a good one.  The most logical reason is that mankind has developed over all the many millenia to utilize and be compatible with nature - and items not found in nature are recognized by the body as toxins.

That is why we see over 95% of all prescribed and over the counter medications have side effects (and why drugs are 62,000 times more likely to kill you than supplements).  That is why we have so many problems due to the chemical toxins and industrial compounds we have spewed into the air we breathe, our soil, the food we eat and the water we drink.  And that is why we are seeing study after study reveal the harm in many GMO created items - such as the ones which create their own pesticides and the ones that withstand being laced with dangerous herbicides.

Plus there is this to consider:  we really don't know what the consequences could be from GMO foods.  All it takes is just one GMO item to have unforeseen catastrophic consequences for the lives of millions, or even billions, to be at risk - and once you let the GMO genie out of the bottle it is next to impossible to put it back in.