If you can't take the heat, then stay out of the comments. 

The internet is full of roasts and burns, the trick to keeping them at bay it always be right and never let them see you sweat. It might be a tall order, but those are the only rules to not getting owned online. 

And in the rare case that you do get roasted in a comment section, just keep it moving, as it happens to the best of us from time to time. Here is a collection of people who weren't so lucky.