Hi there. You can remove recommended videos by selecting "Not interested" on your homepage, this will influence how YouTube suggests channels to you in the future. Here's more about managing your recommendations: https://goo.gl/mfD7rf . Hope this helps.
Thanks for reaching out. If you’re not the biggest fan of a video, disliking it is one way to show your opinion. Keep in mind that if you want to report inappropriate content, you should flag the video instead. Hope this helps!