Billy Mays IS OxiClean. OxiClean IS Billy Mays. [And honestly... How will it ever survive without him?!]
That's why the pallbearers at his funeral's outfits were absolutely perfect and fitting.
Yes, they are wearing OxiClean shirts. Honestly, it may be a little humor during a really sad time, but there's nothing wrong with that. Billy wouldn't have wanted it any other way.