DH and I always leave a tip when eating out if we get decent service, around 10% normally, more if they are extra nice or the kids are extra messy!. But DH will also empty whatever bits of change are in his wallet, eg 1ps and 2ps and add it to the tip. I think this is bad tipping etiquette and a bit insulting. He says it all adds up and it's not like that's all he's leaving, so why shouldn't he. AIBU or is he?