If you want to stop receiving mentions from a particular source, there are two ways you can do that: 

In the feed click on the "x" on mention and select Block mentions from the domain (this action can be applied to any website or social media profile). You will no longer receive mentions from the blocked source. 

Click on Edit query > Sources > Websites > "All websites except.".. and then write the URL of the website you wish to remove.

Keep in mind: When you edit your query, the results from the last 3 months will adjust to your new setup, while results older than 3 months will stay the same as your previous setup.

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