If you look at their username thing, you can see that they’re replying from Mastodon, not Lemmy. It’s some weirdness Mastodon does that Twitter also does where it tags the person you’re replying to and people tagged/replied to earlier in the thread you’re replying to by default, unless you delete the tag before you post. Most people don’t delete the automatic tags. So they probably didn’t do it on purpose and may not have even realized they did.
If you look at their username thing, you can see that they’re replying from Mastodon, not Lemmy. It’s some weirdness Mastodon does that Twitter also does where it tags the person you’re replying to and people tagged/replied to earlier in the thread you’re replying to by default, unless you delete the tag before you post. Most people don’t delete the automatic tags. So they probably didn’t do it on purpose and may not have even realized they did.
@Zoop I didn’t realize that was unexpected on Lemmy. I’ll be more careful about tagging in my replies in the future. Thanks for letting me know!