Observing non-red rubber bands doesn't make a person more likely to have a link to a Wikipedia-accepted source article about it, right? So the person suggesting a Wikipedia edit may just as well Google it themselves.
Yes, you are right I did not try to search for it myself before writing the comment. However I did just try and it is harder than you might think to search for something like this. I suspect if I had a better understanding of British English I might more readily stumble onto an appropriate phrasing that turns up a source.