Avril is great! I don't think she is better than Katy though lyrically, depth wise or even catchy melody/chorus wise.

I would like to see you call Avril "bubblegum" to her face! LOL
You would literally become purple! :)

Again, why add a "bubblegum" in front of excellent pop songs?

Bubblegum became a term referencing the teen idol days of the 1970's with a cute boy singing standard run of the mill relationship lyrics.

Refer to my list above in my post to Andrew. Those are the types of artists that deserve a bubblegum moniker. Not really good songwriters and vocalists that have depth to their music like Avril or Katy.