The best replacement for banter is bullying.

The best alternatives to banter are rated as following:
★★★★★  bullying
★★  banta
★★  lg beacon
★★  backchat
★★  lg scoop
★★  lg rumor
★  motorola hint
★  samsung intensity
★  rumor
★  scoop
  banter

Your alternative for banter is not listed? Suggest!
Speaking about banter, one probably shouldn't forget about lads.

Other search terms related to banter and their ratings are:
★★★★★ lads
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Google Trends

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banter
bullying
banta