No, it is not "asking for" courtesy, it is enforcing so-called courtesy. That IS an infringement of freedom of speech. Sorry.
Also, who decides what "symbols" are considered "offensive?" As DE (now banned for saying "fuck Deron and fuck his rules") pointed out, I (and several others) find the Christian cross far more offensive than the swastika. How are these rules at all helping us?
Sorry, but these rules are complete bullshit. There can only be either freedom of speech or censorship; this is censorship, and as with all censorship, I do not support it.