Replying to people on Instagram is really good for building up relationships and engagement, but the way that you respond to them is so painful! Thankfully, Instagram are introducing comment threads so when you tap reply, the response will nest underneath the original comment, rather than just getting buried in the comment list.
The threads will be like when you reply to someone on Facebook, so it will group things together. It’s rolling out, so don’t worry if you don’t have this feature yet!