Let me post an honest opinion but its just simply my personal.
Yes,The Koreans have been under anti Japanese education environment from school,family and medias.
There is no official material or plan to teach anti Japanese notion to Koreans by the government but its usually done by words from mouth to mouth and speads to the society.
For example,the books which describes Japan badly sold very well in Korea.
The online anti Japan comunities still very popular.
However I would say its getting much better because I find less negative reactions against Japan recently over the net.(the communities where I usually go and check the informations about anti Japanism-there used to be lots of anti japanism promotion messages but recently its very small numbers and people have lost interts in those kind of topics.)-I would say now its better than Japanese biggest online discussion board-2 channel.net's anti Korean thread spreading parade.
by the way,you should know that there are many Koreans who love Japan very much though/.
I would say Not only Korean people's implicit anti japanism does matter
but in overall,Koreans are not veryfamiliar with mixing with foreigners in general.
Check out the nickname of Korea-"the kingdom of hermit" -It really makes sense.
I would call Korea differently as the "regional churl" .
By the way,this tendency would not be changed very easily since Koreans has not been experincing this kind of internationalized mood in her long history.
It has been just less ten years since foreigners can be found on the downtown street of seoul easily like today.
recently Japanese tourists are everywhere in Seoul and Koreans welcome them.