The ignore is made for these creatures, it's a sexy button 

I've only ignored 2 trolls in all my time here, and that was because they were truly obnoxious.
The first was MatTheTwat and the second was the original NotLambchop, but only after playing with her for months with much amusement.
Eventually NLC got boring and tiresome so I put her on ignore. Matt was never amusing, just obnoxious and obtuse.