Whats the chant

In life we have things that are called Jokes, but also in some sports mainly Football we have things that are called Football chants, I was just thinking to myself whats the definition of racism and just plain nastiness, Chants are just to tease the other fans. For my first example Theres e a Manchester United player called Ji-Sung Park and they have made a sing about him and it goes like this:
Park, Park, wherever you may be
You eat dogs in your home country
But it could be worse...
You could be Scouse...
Eating rats in a council house!!!

Now the Mancs love him but is that classed as racist, because it's true they do eats dogs in his Country, but then again a black person may look like a monkey but you don't say it, but then again I think racism is taken way over the top, you can't even say they word black without people giving you a dirty look. But then there the big song that all United supporters hate but all football teams except untied sing is the Munich 58 sing which goes:
Who's that dying on the runway
who's that dying in the snow
its Matt Busby and his boys
Making all the fucking noise
because they can't get the airplane to go

Now I'm sorry but that is a bit of a sick song, United haven't made a song about Liverpool's Hillsbourgh accident because they seem respectful in that department, can't believe i have just said that being a Liverpool fan and all, but then again theirs Jokes about Jade goody, For example
At Jades funeral she wants goody bags for everybody
Cheesy or what.
Is it right that you should joke about someone that's dead in that way, in my opinion. But then again that's life. You'll never get rid of it.