No one can say anything tongue-in-cheek, lest you take them seriously?
I'd say, your brain is not engaged.
It is usual,on FR, to use (/sarcasm),at the end of a post,when it's meant as such/tongue in cheek. Elsewise,nobody knows that you aren't posting something you really mean.
You posted it twice,BTW,so you came across as being serious.Not being a mind reader,I and others took your post to mean what it said.And my brain works very well;unlike some others who post here. ;^)