I don't know about that, that seems a bit harsh.
No one should have to deal with a broken heart quietly or have to stop talking about something.
Remember your words have power behind them, they can comfort just as much as they can hurt. They also have the power to help other understand your point of view or even your opinions on certain topics.
In this instance, maybe you could explain why you don't want to hear about it so he could understand why some others might not want to read that sort of thing.
Also could be handy to mute the topics you don't want to see just in case others do want to talk about them.
I know I would definitely mute topics on eating Cheese by itself (half joking hahaha)