try not to judge others; just worry about myself, and I would not wear casual to a funeral. But there may be a reason for it. Went to a business event last week where the code was for business casual and a number of folks showed up in tee shirts and untucked.
I observed a coworker perform interviews in flip flops and unshaven - - oh hell no - for me.
Personally I am trying to progress to not communicating like I just left the military for PC purposes.... kind of falls along the same lines...