There are no such thing as a fireproof tent, teepee, tipior any thing else then can be used as a tent or shelter. If it gets hot enough it will burn. Most materials used in clothing, tents sleeping bags, blankets whatever when ignited burn at several hundred degrees faranheit. Cooking fuels and other petroleum products plastics included burn at over 2,000 degrees faranheit.
Your best bet is flame or fire retardant materials. They will burn but not as rapidly as those materials that aren't.
It may soound like I am splitting hairs but I am not. Just because it says flame reatardant or flame risistant it will still burn.
I just want you to be aware of the difference and be prepared. If you are still around after a disaster we may cross paths and sit down under a shade tree with a cold drink and enjoy being alive.