I'm just curious what your exact response was, and how she reacted? I've seen people become disproportionately offended over non-issues, which prompted aggressive responses. Could that have happened here?
Almost everything at Taco Bell is [censored], but I do love their steak Grilled Stufft Burritos. steak (albeit pretty low quality,) rice, tomatoes, lettuce, guac., and sour cream - pretty legit burrito, to be honest.
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As far as the donation, why would you not be able to claim it on your tax return? For those of you who do give in to the demands of fast-food charities, how much do you actually give at retail and fast food places? A buck? Ten dollars per year? I hope you're not missing out all of that return money!
In all seriousness, I've never had to do more than pleasantly say, "no thank you" and finish paying for the thing I buy. If some one gave me [censored], I'd hopefully be in a mood to cleverly give them [censored] back. If not, my typical Dexter-type response would probably work well enough...