Falling on your sword doesn’t mean what you’re trying to imply in this context but I digress.
You’re right, there isn’t a whole lot you can do about this particular example. However it is likely at some point in your life you will witness a relationship that is unhealthy or abusive and then what will you do?
For whatever you think about celebrities the behaviour they exemplify does have an effect about what is permissible in society generally, they set ‘trends’.
Right now in my opinion society (largely the media) is saying it’s all cool and normal and so I’m expressing my frustration in the greatest artistic medium of our time, memes.