Why is it irresponsible to grieve in public? Isn’t public grief the point of a funeral or any number of other ceremonies?
As far as the people making a fuss, fact is that a significant number of racists have been enabled by the Trump win. People who are one of the ethnicities that Trump (and his supporters) have railed against have every right to feel threatened, uncomfortable, and angry.
Same goes for anyone who has close friends, family, or significant others.