I belong to a Facebook group for mountain biking in Ontario. People will propose rides on there, and of course the other folks who want to join in will use the comments to indicate that they’re coming, discuss the timing, carpool, and so on.
And then there are always a few folks who chime in with “Sorry, can’t make it” and “Sorry, not interested.”
What we’ve discovered is that such messages do absolutely nothing to help the group with anything. Unless someone has already said they are interested, we discourage saying you’re not interested. It simply adds noise to an otherwise productive discussion.
That’s my anecdote in response to what appears to be a declaration that you are not interested in this post.
Going a bit off-topic, this happens on Facebook because when you decline an event it shows a text box asking to "say why you can't go". If Facebook would remove that textbox from the dialog, this would likely happen much less frequently.
"The real question is, who gives a fuck?"