Assalamu 'Alalikum Wa Rahmatullah. No it is not good Muslim etiquette to celebrate anyone's death. Your character is on display when you do anything. What does a character of one who behaves in this way show about him/her? It is a shameful and low behaviour.
Allah Subhanahu Wa Taála says:
O you who have believed, let not a people ridicule [another] people; perhaps they may be better than them; nor let women ridicule [other] women; perhaps they may be better than them. And do not insult one another and do not call each other by [offensive] nicknames. Wretched is the name of disobedience after [one's] faith. And whoever does not repent - then it is those who are the wrongdoers. (49:11)
My Allah bless you in your striving to follow the right path.