You can go further if you use the web interface + #Tampermonkey #userscripts. You can catch literally any unwanted posts according to the criteria that you set yourself. Yes, this is not at the server level, but just filtering in your view, crooked, askew, but it works 
johan@s.cafe
@johan@s.cafe
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If you follow someone whose own posts are good but they boost too much, you can hide just their boosts if you want: