Uh… no, it can’t. You could just say, “puking into a toilet,” instead of, “Speaking Chinese.” That was incredibly insulting to them (even while they have their own unrelated issues). What if I said pooping off the edge of a skyscraper was called “speaking American?” It’s the same preposterousness. Idk where your relative got that phrase from but it’s certainly not well-known, nor should it be well-received.