As the Massachusetts restaurant industry rebounds to pre-recession levels, the customers are back, but their manners aren’t always. Parents are changing baby diapers in booths. Besotted pet owners are trying to sneak in small dogs. Smartphone addicts are ordering meals while chatting on their phones. The spoiled are threatening to rant on Yelp if (unreasonable) demands aren’t met. They’re sending back dishes because a pal’s entree looks better, and storming out if they’re not seated immediately. Boors are calling servers “Yo,” boasting about their wine cellars, demanding to switch tables. Locavores are interrogating servers about sourcing. The particular are using the menu as a list of ingredients, or claiming food allergies they don’t have. And the inconsiderate are skipping out on reservations. Full story for BostonGlobe.com subscribers.