Ask HN: How do you deal with overly negative comments?

It seems like the longer I use the Internet the more I'm aware of just how many people use it exclusively to act like ass holes without recourse.

Particularly insidious are people who seem to poison any positive outcomes by spreading falsehoods and doubt. Sometimes even simply by having a shitty attitude.

My question to HN is: how do you deal with people who seem to go out their way to spread negative comments.