He is saying that it's the equivalent of someone giving you Euros instead of dollars if you work in New York City as a tip. You'd have to go to the bank and convert it and shit before it's worth anything to you. Reading about bitcoin and making a wallet and storing it on your phone or computer at home is way more intrusive to someone who doesn't know about it. You're forcing someone to use your standards instead of just tipping them in the local currency. It's rude to impose YOUR wallet system on someone else who doesn't use it yet. It's different if they know about it already and you then ask to use BTC for tipping. Servers want to go home and sleep after a shift, not spend a day figuring out how to get 20 bucks in bitcoin into their bank account. People will use bitcoin when it's convenient for them and not convenient for YOU.