What is deemed "justified criticism" is obviously very subjective. What's justified to me might not appear so to you, and vice versa. Having
said that, obvious hatred isn't so hard to define, and yes, many go beyond criticism into the rabid territory of pure hatred.
I'm not American; I was born and raised in the UK, but have lived here since 1996; I've lived "both sides", if you will.
My perception is this:
In Europe we're shown a lot more "negative" press relating to the US; there tends to be more broad coverage of certain events (those of a
political nature in particular) with a little more attention being paid to whoever is on "the other side" of the situation. This makes it very
difficult to blindly adopt a stance of "The US is generally in the right"; it also encourages a perception that too many Americans do
support the actions of their government without question
There's nothing sinister behind such feelings of increased criticism; perhaps a growing awareness that the American Way Of Life isn't suited to
everyone on the planet is a factor?
Many people - Americans as well as non Americans - also perceive the current situation in Iraq to be one rooted in nothing more than falsehoods and
bullying. Whether this perception is grounded in truth or not isn't really the factor; the point is the peception exists, and that often leads to
a distrust of other
foreign policies/actions committed by the US.
Obviously, resentment and anger also contribute to any negative feelings towards a nation; for example, if someone has a personal loss associated
with that nation, their perspective will be much more likely to degenerate into hatred. The US isn't the only country subjected to this type of
feeling; there's a lot more media attention paid though, and this serves the agendas of both anti- and pro-US feeling.
What can be done about it? Though this suggestion is often ridiculed, perhaps "Taking The Ideas Of Other Nations Into Account When Making Those
Decisions" might be an idea; again there's a widely-held perception that the US either doesn't care, or doesn't want to care, about what another
nation might think about a particular global issue. This is hardly the best way to garner support for a cause.
Hatred that is based purely on a person's origin, ethnicity, etc - that's a different animal. And one that's much more difficult to overcome.
The idealist in me still wants to stand up and yell "Can't we all just play nicely?!"