Thats a weird takeaway, why can't you let people enjoy things that don't affect you?
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You're not being stopped from having an opinion - your comment is visible - but sharing one that'll only serve to bring down people's moods makes everything a little bit worse I think.
Strange analogy, considering this is a public forum, and I'm expressing my opinion about the shared link.
If you don't like it, you're free to engage or ignore it. The idea that only positive opinions should be expressed is infantile.