I'm pretty sure every site has had at least one Commentgate -- where a user posts on Meta to complain that their Very Important Comment was viciously deleted by a moderator who was drunk with power. The usual and customary response is to remind the community member that comments are second-class citizens, subject to removal at any time for basically any reason; comments are ephemeral and should be treated as such; &c.
When you look at UX though, comments are given almost equal weight to posts. In fact, their position below a post is the only thing that really implies their subservience.
I'd like to suggest two possibilities for making comments more noticeably unimportant.
Make the font size of comments smaller. Comments are a little smaller already, but there's some wiggle room for shrinking them further. The difference on the Android app is striking. Speaking of which...
Make the font look more casual. Makes the comments look more like notes and less like officially printed, professional, important stuffs. In other words, it makes them look more like a comment and less like something that should be enshrined forever.
Please forget about the example font. Imagine a casual, readable font instead, something you enjoy looking at that at the same time says "I might not hang around forever because I'm not as important as a real post."