How can I hide inappropriate content on YouTube?

You might want to consider setting up a YouTube Kids account if you're trying to filter out inappropriate videos. It's specifically designed for younger audiences and has stricter content filters.

A few things can help:
1. Clear your search history.
2. Delete past watched videos.
3. Mark videos you're not interested in as such, and do that consistently for a week.
This should help in customizing your feed. Alternatively, you could look into using YouTube Revanced to add keywords to ignore.

Unfortunately, there's really no way to completely block all the content that some might find offensive. It's pretty subjective; what bothers one person might not bother another. Plus, even if YouTube set strict definitions, detecting what counts as vulgar can be really challenging for the algorithms they use.

Try using a bit of parental discretion. You can also clear your YouTube search history and watch history, which can help change what videos are suggested to you. It’s a good way to train the algorithm to know what you prefer.