So far, a good initiative. You are doing everything you can to adapt to Bitcoin. Truthfully, the idea isn't that bad. But it doesn't seem overly expensive to me, and it seems to work. No matter what criticism you receive, ignore it. I truly appreciate you using your own money to support Bitcoin. At least many people will learn about Bitcoin. I'm not sure, though, if the slogan is ideal. Others would offer their thoughts on that. Keep going.
Should OP really ignore those criticisms ? I feel like he should read em up and filter what's both good and bad from whatever been said.
It's only someone that's weak that sees positive criticisms as insults. But as you've encouraged, I'll ask add up to say that's a good one there, there's a possiblity of five people out of ten who sees that sticker's ( will definitely make little search about what Bitcoin is )
OP! Don't be scared if people mock you cause your English is bad or you're not very good at speaking fluent English in public, gather them all round and improve your ass. Those are one of the skills needed as you go, communication skills and convincing skills.
It's a good step also to learn, teaching what you've got little idea and knowledge of. I'm wishing you good luck here, abide by the rules.