[quote=@Sep]"It's"
D:
-goesandcriesinthecornerlikearealman-[/quote]

No, "its". 

"it's" = "it is"

"its" = "of it"

Although, after looking up the idiom again, it should be "to each his own", which would still mean I'm right, grammatically speaking.

http://dictionary.reference.com/browse/to+each+his+own