The original comment was
> Designers love grey on grey. I’ll take comic sans any day.
These are two orthogonal features. It's like saying "fashion today is really into high waists, but I'll take denim any day."
Denim has a design style to it that goes beyond the material, as does comic sans. Like, you could put "comic sans" as part of a dalle prompt, and it would do more than pick a font
In this case, click the post link. It’s black text on a white background. Comic sans would work fine, and it would be better than a monospaced font added for some nostalgia for a time when fonts could not be kerned.
That comment explicitly mentions a typeface (Comic Sans).