The phrase I hear all the time now that drives me crazy is: "Not a problem!" or "No problem!".
This is usually said instead of 'You're welcome' nowadays.
Whenever I am at a restaurant and I thank the waiter when they put my dish down, or buying something at a store, or whenever I am just saying "Thank you" to someone holding a door open for me or for basically any reason at all...they throw "Not a problem!" back at me.

Like there might have been a 'problem' in my buying something from them? Or there might have been a 'problem' with them bringing the food I ordered, so I should be grateful? It makes it sound as though they did me a favor by deftly skirting any 'problems' inherent to helping me or performing a service. What ever happened to the more gracious and friendly "You're welcome!" which is said with no implied strings attached ?