Is there a way that people could talk back against this?

I was thinking: What about 100-200 people get together, all people get t-shirts saying something like:

"Bitcoin is neutral, just like cash" on the front. And on the back it says:

"RBC is acting unethically
denying legit businesses"

Then once a week make a peaceful appearance at the bank. Walk into the bank, fist a few of you, then some more, and eventually the entire bank is filled with people with yellow t-shirts with your message. Have some good spoke person that handle the media, and make the case known. Also, if you can find the private addresses of some of the banksters of RBC, make sure to gather a lot of people outside their house on the street, do some barbecue or otherwise make your presence clear.

Also contact consumer organizations and politicians and make your stance clear. That would in fact be really cool if you bothered to do this.

If people just become mad and close their accounts, that will not really make any impact.