This was published back when Superman could push planets from their orbit without breaking a sweat, by the way. It makes no difference to him if you're ten or 1000 pounds -- he's just being an asshole. It later turns out that there was no need for Lois to hide from Superman anyway, because he knew about her weight issue all along. He just chose to ignore her to save her the obvious embarrassment that should always come with being overweight, it seems. A real class act, that fucking Superman.
Yes, Superman is the kind of douche who thinks his regular clothes are good enough for weddings.
But how did he know? Because he orchestrated the whole thing, embiggening Lois in order to disguise her from a dangerous criminal.
Hey, here's an idea: How about just GIVING HER A PAIR OF GLASSES?