Perhaps you are none too bright.
Or courteous.
I guess I’m not very courteous then.
As to the OP, I’m just fine with tipping as long as I am in control of how much to tip. I don’t like the system where all the tips go into one “jar” and are then distributed equally at the end of the shift. That smacks of ?…?…? The word I’m looking for escapes me at the moment ?…?…? But that’s what it reminds me of.