not for real though, if you don't want to talk to someone then I fully support not talking to them
> I have some autistic-like personality traits and I get a lot of stress when I don’t know how to broach conversation with a customer
Think about it this way, there isn't any need to stress if you pretend you aren't serving them at the bar. What would you say to someone you just met?
As starters:
Remember that most of the talkers at the bar just come to have someone LISTEN. As a bartender you only have to encourage them to start talking, then give feedback and questions until they get going. If at ANY time you aren't comfortable or need to stop use the, "check on an item in the back," or, "I'll be back I need to take care of those customers."
If you want better tips or how-tos, a good starter book is:
Conversationally Speaking - like an introduction into small talk
OR
How To Speak, How To Listen - a deeper and more in-depth book on small talk