Found out in another thread that Jerboa does support this.

Tap and hold the space at the top of the comment next to the username and it will collapse the comment thread. Tap and hold again to expand.

I love how they've stickied a comment to try to direct you to the answers because he's ignored so many highly upvotes questions that the few things he DID answer are buried.

First time I opened Relay in a week and it was worth it just to see the dumpster fire before turning around and heading back here.

ROCK AND STONE!