Re: BFing at a funeral
The only way this would be "out of place" for you to feed your son, is if he was a very noisy nurser. It is upsetting to be at a funeral in many cases. Especially to the family. To hear a baby making unusual noises might be distracting.
I have seen MANY MANY women nurse their child and I never heard a sound.
If they were just upset with you for breast feeding, I think that is a little strange, especially if you were being discreet. Why would it bother them?