There are multiple ways to avoid seeing Blogs. The first way is to filter them from the Search results by clicking on a Primary Entry Mode other than Blog Comment.
The more permanent way is to click on Settings:
Which takes you to your profile page. There is a list of all of the Tags. Each tag has a toggle that allows you to hide all Sweeps that have been tagged with that particular Tag.
Here you can see that I have "Blog Comment" set to Always Hide. Which means I will never see a Sweep in my search results that has been tagged with "Blog Comment". There are actually multiple blog related tags: