Your view of what's here can be modified by three things...
- who you choose to put in your Aspects (follow)
- who adds you to their Aspects (sharing with you)
Also, there are two distinct streams available:
The latter is a free-for-all where you will see post from anyone and anywhere with any content.
The former, your personal stream, is determined by Aspects/#hashtags
/people sharing with you. Yes, some crap will seep in to that stream, but not as much as you will see on the Public one.
If someone is sharing with you and you don't care to see their posts (not replies, just their original posts), then you can Ignore them by pulling up their profile and click the Ignore icon (circle with line through it). This will prevent their original posts from appearing in your personal stream, but not replies they leave on other people's posts.
It is what it is... until improvements in true blocking are instituted here.