I have no issue with warnings on anything. I can choose to ignore them if they don't apply to me, but have no wish to have others upset by something just because it doesn't bother me, or to inflict my sensitivities on others.
A word like 'frog' in a film about the war wouldn't offend me, but I would rather know in advance if a film had a graphic rape scene, for instance, so that I could be forewarned, as I would find that upsetting. Others might feel the opposite, and neither would be wrong.
I see it as no different from warnings about peanuts or flashing lights. Neither will affect me, but I don't think it's 'going too far' to let people know about them.