Is it rude to eat your own food that is not from the restaurant you’re eating in?

My husband and I sat down for a meal at “Bistro Romain” in Paris. We were starving. The server took a long time to come to our table, and when he did he rudely asked us what we wanted. We ordered our food, and proceeded to wait for an hour for it to arrive. When it finally arrived, my lasagne was still frozen in the middle. I hate to complain in restaurants, but I had to mention this to our server. He rudely took it back to the kitchen, saying he would get another one. 30 minutes later, there was no sign of my dinner. At this point, my husband got up, and told me he would be back in a few minutes. He ran across the street to a McDonalds, and brought us back burgers and fries. We ate them right there, at our table at “Bistro Romain”, daring our server to tell us to leave. They were delicious, and yes, it was rude.