Anyone who won't go there or feels 'unsafe' because of the name is certainly someone whose patronage you shouldn't want. In fact, they sound like people most of us would like to slap for being such brainless snowflakes.
I really don't agree. One of the people who told the owner he felt "unsafe" was an aboriginal who attended a residential school. Who knows what that person went through, could be some real PTSD, and Sir John A was the PM who put that system into place. Not sure many Jews would want to hang out in a place called Hitler's Pub (not saying Sir John A is equatable to the level of Hitler).
My opinion is that person and people like him are free to not go there, but changing the name for a select few who are sensitive about it is a stretch. If we sensor everything that may offend someone, we'll have nothing left. I once threw up as a kid after drinking orange juice, now I still associate orange juice with vomit so I can't drink it. Ban orange juice?!? If you don't like it, leave it, don't spoil the party for everyone else.