You're free to do so, but not on my 210 byte relay!
Discussion
ouf - that's gonna be a harsh reality - what about pics?
On a related but off-topic: does ANY client simply allow you to press Ctrl+V to paste a picture into a note? Iris doesn't and I haven't tested anything else (cos I am quite a fan of Iris!)
Some buildings require a certain dress code. Same thing.
hmmm - the analogy might be different - I can still reply with long notes and any other relay can have users that can interact with my long note.
So you will in effect cut yourself off from the conversation rather than the other way round.
It's a bit like the scene in the second ever Superman movie where the villain locks up Superman thinking he is going to kryptonise him and he ends up kryptonising everything OUTSIDE the chamber -- (if we are going to get a good analogy :D)