frankie boyle's beanbag chair of death

So I absolutely will never touch Threads in my life but I did log into facebook for a hot minute just now and... my feed is nearly entirely reccomended posts from meme pages. But they're not memes that make any sense to me. Facebook seems to have decided at some point I'm a mechanical engineer or maybe a car mechanic. I have no idea why it thinks this. The only thing that could possibly be skewing the algorithm is I did scrape about 100 shitty crafts videos with youtube-dl at some point last year intending to do a stream with them that hasn't happened yet. But I don't understand why that would be getting me memes about welding?