You can hide a post:
If a user you follow posts something you don't wish to see in your feed - but you still want to follow them - you can decide to hide the post.
To do so, tap on the three dots (...) at the bottom right of the post to hide it (the person who posted does not know you have hidden the post). To see all the posts you have hidden, go to Settings.
You can block a user:
To avoid seeing a user again, by going to their profile page, you can block this user by tapping on these the three dots (...) as well and choose "Block this post".