Like one who grabs a stray dog by the ears
is someone who rushes into a quarrel not their own.
Back when I was at Mars Hill there was this guy who would preach most every week. The way he might frame mention of this verse is that if you're a person who goes on the internet, and is thinking about sounding off on some topic of controversy that doesn't actually directly involve you or people you love, that opting to rush into that kind of thing makes you, not sinful as such, but maybe a total idiot.
Not that the kinds of people who insist on commenting about controversies they aren't involved with, dealing with people they've never met, will do other than sounding off on that stuff on the internet.