Dude is doing what mastodon users do and tagging random users without reading their autocomplete, posting their random shower thoughts to Lemmy instead of tagging frameworkcomputer@fosstodon.org or sticking to hashtags like a sane person.
They responded as such because mentioning @ framework made it show up as a post on the framework community on lemmy. They presumably didn't understand why, and just thought you were being weird by posting a framework ad on the framework community (where everyone already likes framework)
You @ed the lemmy community for framework, not a mastodon account 😅
For those seeing this on lemmy who don't understand, this is a post on mastodon, but op accidentally @ed the lemmy community, so it shows up as a post on lemmy. Its like if you tweeted something but @ed the relevant subreddit so it showed up there as a reddit post also
(Also: Mastodon is bigger than lemmy and often has more permissive image hosting, so sometimes its useful to use a mastodon server's image hosting to post on lemmy if your lemmy instance has convoluted rules about image uploads that are hard to manage, especially from mobile. Just @ the complete name of the lemmy community on an image post via mastodon and it gets posted as a lemmy post to that community. The first line of text becomes the title, the rest of the text becomes the body of the post)
@Cris_Color 🤯 wwwwwaaaaa? I'm like, what's a lemmy? Who are they? I mean, how did they get here? Or were they always here, and we/I just didn't know they walked among us? Are they tiny or invisible? Did I step on one by mistake?
For folks viewing your post on lemmy it looks like you posted an ad for framework to the framework "subreddit", called a community here. But if you look at the account that posted, they'll see your account is on a mastodon server.
If you edit your post and look at the full address of framework you @ed you'll see you @ed the lemmy community, and not a mastodon account dedicated to framework