And that's perfectly fine. Although, it's also my opinion that if you don't like seeing something on DA, ponies for example, then it's easier to scroll past it and ignore it than it is to dig in and be a dick to people. It's also my opinion that doing that is a healthier option, as I'm usually in a generally better mood and have a more enjoyable time on the internet if I skip past the shit I don't want to see.
Cool. That's fine. Cut it out of your life, then. Ignoring it isn't the most pleasant option, because I'm sure you'd like to have it scrubbed from the internet, but the problem is that it won't happen. A few DA comments won't make it go away, so the best option is to just not worry about it. Focus on bigger problems. You've got your own life, I'm sure there's plenty of goals or issues that you'd do better to put that energy towards. And if it bothers you so much that you can't ignore it, then think bigger. MLP will fade out of popularity eventually, but there's plenty of pedophiles and zoophiles out there, and more every day, I'm sure. Find out more, research, and think of a way to prevent people from delving into it. I have no earthly idea how, but it's not me that's working to make that change.