Some thoughts about trolls:

(1) Any fine poster who is even slightly unkind will pick up trolls, like ivy on a great tree

(2) It follows from (1) that if you attract trolls then this is a sign that you are a good poster -- yay

(3) The ability to tolerate trolls in the sense of not being angry with them is a measure of your self-confidence.

(4) You feed and retain trolls them by responding negatively to them. You 'destroy' trolls by being nice to them.

(5) Powerful trolling is indistinguishable from good criticism

(6) It follows from (4),(5) that one way to destroy trolls is to cheerfully acknowledge any good arguments they may provide, however vile the tone