Yikes. Definitely need a way to mute notifications for a particular post. I don’t know if this is something that should live in the Microsub client or in the sending Webmention server. I could make an optimized feed for Webmentions that’ll collapse a bunch of reactions made into one of them. That’ll mirror more of what we see in other platforms.
That would require a bit of thinking around how that would look and then figuring out storage. Might make for an interesting feature in Lighthouse.