Well, he says he's been sitting in that tub for 12 hours already because it's his "safe space", which itself is a term coined by the US alt-right as a refuge for people who are offended by alt-right vernacular ─ the people in need of "space spaces" are themselves referred to by the US alt-right as "snowflakes". There are plenty of alt-right cartoons ─ presumably all from the same cartoonist ─ that depict politically left-leaning individuals as babies with diapers and/or as stereotypical emo characters with body piercings and dyed-blue or green hair, and that show them inside a so-called "safe space" (e.g. a play pen).
So, taking it all literally, I imagine that after 12 hours in that bath tub, the water won't exactly be warm anymore, and thus it wouldn't be much of a cossetting "safe space" anymore ─ unless you live somewhere near the equator, or in South America, South Africa, Australia or New Zealand this time of the year. :)