NEW YORK (AP) — Across the country, there’s a silent frustration brewing about an age-old practice that many say is getting out of hand: tipping. Some fed-up consumers are posting rants on social media complaining about tip requests at drive-thrus, while others say they’re tired of being asked to leave a gratuity for a muffin or a simple cup of coffee at their neighborhood bakery. What’s next, they wonder -- are we going to be tipping our mail carriers and dentists, too?