Sounds like you pretty much have it.
-
original tweet is opening a conversation about how halloween costumes affect people with ADHD
-
The quote tweet is insulting the original tweet.
-
the tiktok poster, presumably someone with ADHD, who presumably has some agreement with the quote tweet, has put the banner on their wall so that it will "motivate them to get out of bed in the morning" lest they get (figuratively) insulted by the quote-tweeter (who they agree with).
I think it's true, largely because "American Socialism" on the best of days is the pretty much the same thing as "Nordic social democracy". The actual cool shit will be happening outside of the US.