As I write this, the quote I have on my front page is "Thinking is a lot like lifting heavy objects.  It is an exertion, and people avoid exerting themselves."  

Philosophy has many definitions, both formal and informal.  I will not repeat them here, you can google them yourself.  But it involves thinking.  Lots of thinking.  That type of exertion that people are averted from doing.  So when a bunch of really smart people do a whole lot of thinking about something and come to a decision (like demoting pluto from planet), there will always be a bunch of people objecting because otherwise they will be forced to think about the topic, and that is an exertion.  They would just rather complain, because that's easy.

The problem with pluto is much like the problem with the word island.  How do you define an island?  Well it is a piece of land surrounded by water, right?  That is about the most accurate definition we have.  By that definition, we can probably all readily agree that Hawaii is a series of islands.  

In order for the definition of island to be useful, there must be land which is not island.  Otherwise, if all land is island, it would be a useless definition.  The reason the color blue is the color blue is because there are other colors that are not blue.  If all colors were blue, it would not be 'blue', it would just be 'color'.  If all land was island, it would not be 'island', it would just be 'land'.

Most people would consider Australia a continent, but it is a well-defined piece of land surrounded on all sides by water, so it fits perfectly the definition of an island.  For that matter, so does every continent on Earth.  But those aren't islands, they are continents, so there must be some degree of separation there.  Continents have their own continental plates, where islands do not.  Hmm... we have refined our definition slightly...

Lets consider another example - Manhattan.  Many people refer to Manhattan as an island, but does it qualify?  It is part of a peninsula on the northeastern corner of the U.S.  It just so happens that the Harlem river traverses the Manhattan peninsula, technically making it surrounded on all sides by water.  Or is it?  Do bridges count as land?  I think not.  But Manhattan is not removed from the main land mass.  If the Harlem river dried up or was dammed, it would be an obvious continuation of the land.   Lets support, for now, Manhattan being an island, because of the river.

By that precedent, the system of rivers, lakes, and dykes in southern Florida means the entire city of Miami is also on an island.  The Amazon river cuts out huge chunks of South America, surrounding them with water and making them islands.  Obviously these examples should not fall under the definition of 'island', but as we have it defined now, with Manhattan, they do.  Careful consideration must be placed on these things, for they are dividing a continuum.  The only rational for dividing a continuum is because it is useful to classify certain segments by their qualities or ranges.

If you *really* get into it, you find there are more details than perhaps you wanted to know.  There are not just islands; islets and eyots are also pieces of land surrounded by water with slightly different qualities and definitions.  You have probably seen many eyots in your life, but you just called them islands.  These are further subdivided and grouped in different ways.  Quickly you are dealing with archipelagos, skerries, reefs, atolls, tidal islands, volcanic islands, etc. etc. etc.

Hopefully this serves as an example of how such a seemingly simple concept as an island can, when you think about it, explode into a massively complex mess and system for dealing with that mess.

So please, don't complain about what people who are dealing with messes like this are doing, without having given it considerable thought and research yourself.  The decision to reclassify pluto was not simply the whim of the scientists.  More thought was put into the decision than you probably care to know.  So don't think about it like you have lost pluto, rather remember all those you have gained, like Eris, Makemake, Haumea, Sedna, Orcus, Quaoar, and Varuna.   Where is your bleeding heart for them?