Definitely, the more you listen to Christmas carols and the less you listen to Kingdumb sxxx, the less the Kingdumb sxxx is going to be able to spoil your Christmas songs. And, it pays to really listen to them--if you start with the classics, I recommend getting the real deal on them. Bing Crosby, Gene Autry, and Andy Williams all have excellent renditions. At first, you want to listen to songs that are actually sung, as the instrumentals will still be confusing. You can listen to the instrumentals once you learn the lyrics, since then you can pay attention to the lyrics of the songs you want. For a while, however, Kingdumb maladies might still pop up in your head--bear in mind that there was a time when you dreaded Christmas songs doing this.
I do recommend Trans Siberian Orchestra, since they have an aggressive style in playing Christmas songs. Yes, they are instrumental--but very unlikely to be similar to Kingdumb maladies. I also recommend the song Carol of the Bells, in addition to all the above--try to find a version that includes the lyrics so you can learn them. And, there is one song that was out in 1993, from Carnie and Wendy Wilson, called Hey Santa!. This is a contemporary Christmas song--and, if you can locate the whole album, it pays to get that.
Of course, the most important thing is to get rid of Kingdumb Maladies. The "good" news is that, if you are still required to go to boasting sessions, the Kingdumb maladies from years past are all gone. (The bad news is that the new Kingdumb maladies are even worse.) After several years of no Kingdumb maladies, and yes Christmas songs, your problem with Kingdumb maladies coming in and ruining your Christmas songs will get less. It goes faster the more you listen to Christmas songs with lyrics so you can actually learn them. Also, go online and hunt for the lyrics there--it will help you learn them that much faster.