I’m sorry people are harassing you. It’s sad that Internet is often a place of trolling and showing a lot of unecessary aggressivity… but thankfully not everyone behave like this. Just the fact that you were helping someone shows that good things can happen online, and that’s really awesome!
Good thing that you reported and blocked them. Not everyone does that, while it’s helpful and important to keep places safe. Regarding the deletion of your comment or not, I’d say do what is safe for you and what you believe is fair. If you delete it, that’s okay. If you don’t, maybe avoid the subreddit for a certain time (also to give time to the mods to react). If there’s a lot of negativity, you don’t need to let your heart be affected by what’s posted there.
Thank you for helping someone out there, it’s really neat. You’re awesome. <3