Reference to the hotpot scene from Conquer. This is also a reference to Youmu winning the 17th Touhou Popularity Poll.
The linked video has been edited to loop. It is difficult finding an unaltered version of the scene; trying to find them will either turn up meme-edited ones or "social commentary" pieces (about violence in media or real life or whatnot).
The meme line is often snowcloned and used (jokingly) on the Chinese interwebs as a cliched tough guy "don't mess with me" line (sometimes like the Navy Seals Copypasta too, when quoting multiple lines of this character).
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As for this artist's art style, seems like they usually draw Touhou characters enacting Chinese memes, often going intentionally for stylistic suck in the process, imitating Chinese 60s-80s style posters. Like a Western artist drawing "cursed" art, kinda.