@Monomeeth The sites consider nonsense "offensive" so flag as other and ask for a second opinion - or for us to help you know if flagging was good in the case.
As long as it's not mean to someone else / cruel / unkind - it's probably not rude if it's a poor attempt at humor (especially if the but of the joke is the person making the joke) - I was so stupid to not see vs you were so stupid to not see.