If you want your writing to convey enjoyment, write about people you respect. Writing to destroy and to scandalize can be as destructive to the writer as it is to the subject.
William Zinsser—On Writing Well
I like this quote, and I like it even more if I edit it to reflect Twitter:
If you want your tweeting to convey enjoyment, tweet about people you respect. Tweeting to destroy and to scandalize can be as destructive to the tweeter as it is to the subject.
Although I have no desire to engage with the people who tweet in anger, or in hate, or in rage, I do feel sorry for them, because they are becoming what they are espousing to be against.
Twitter may not just reveal one’s soul (see my post, In Twitter Veritas), it may destroy it.