I find it a bit weird that you’re publicly criticizing people for sharing poorly sourced claims…while not sharing any links to the supposed articles that were so bad.

Anyway, here’s a BBC article about oceans warming. “13.8C” appears in it. But it doesn’t claim oceans globally heated up by 13.8C. It says a specific area of the ocean was 13.8 C hotter than average in March, while making it clear that the oceans globally were nowhere near that much hotter than average. https://www.bbc.com/news/science-environment-65339934

P.S. I do think it's reasonable to be a little nervous about that 13.8C number--it's really enormous, and it is off the scale for that map that the Wired article shared. But that's not the same as what you said.