Likes, Instagram photo tags & mentions
If you block someone on Instagram, all their likes and comments will be removed from your posts. This is permanent. Even if you unblock them, you won’t get their previous likes and comments back.
In the future they won’t be able to like or comment on your future content either. Blocking them means Instagram will prevent them from seeing your Instagram photos, captions and stories.
Having said all that, proceed with caution. Even if you’ve blocked someone, they’ll still be able to see any likes or comments you make on public accounts or accounts they follow. Say for example your favourite chart-topping musician or Hollywood actor posts about their latest release on their public profile. If you like the post or leave a comment congratulating them, anyone you’ve blocked will still be able to see what you’ve written.