Aside from blocking posters altogether, you can also make sure no profanity is in the comments on your posts by adding filters. To filter the comments on your posts, tap on your profile, then tap on the gear icon. Scroll down to comments and tap on it, then toggle on "Hide Inappropriate Comments." This will automatically hide any previous and future comments that contain profanity (Instagram has a default list of profanities). You can also include words in a custom list by tapping on the box below and entering any words you want blocked, separated by commas.
While Instagram keeps track of any posts that you've liked so you can see them again, that can become a lot of posts to sift through, and you might not necessarily want to return to a post just because you liked it. A better way to keep track of posts that you know you'll want to view again in the future is to save them. To save a post, simply tap the bookmark icon on the right of the screen, beneath the photo.
You can see all of the posts you've ever liked on Instagram by tapping on your profile icon in the bottom right, then tapping on the gear icon next to "Edit Profile." Scroll down to "Posts You've Liked" and tap on it to see all the posts you've ever liked. You can change between list and grid view with the buttons at the top.
Instagram offers several privacy settings that allow you to avoid specific people. You can block people by opening up the app on your iPhone and tapping on the target user name to bring you to their profile. Then tap the "..." button in the top right and select "Block." Verify that you want to block them and tap Block again.
There are several privacy options that you can employ on Instagram. If you only want particular friends and family to view your posts, you should make your account private. If you want to remain public, you can block specific people. Neither method will drop followers you have already picked up though, so you will need to do that manually. Launch your iPhone Instagram app and tap on the profile icon in the bottom right.