I have spent as career working at Praxair on All sorts of related equipment including high purity high pressure Oxygen compressors. Please believe all of the warnings you hear about oxygen. It may not always be disastrous, but it has the potential to make a catastrophic event. Many factors, like the concentration of flammable material exposed to the oxygen, its concentration, pressure of the gas, velocity, ect all can have an effect on the reaction. The main thing to remember with an oxygen "fire" is its violent. "Fire" is really the wrong word, Once the reaction starts, the gas spontaneously detonates everything flammable near it until either the fuel ( as mentioned earlier anything made of metal, yes even stainless steel burns quite ) or the gas has been consumed.
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Think of this real world true experience. A 10,000 HP Ingersol Rand reciprocating oxygen compressor boosts oxygen in a pipeline from 200 to 300 PSI that feeds a steel mill. A suction screen in the inlet pipeing the he compressor starts to fatigue and a fragment of it goes into the compressor. It get between the piston and cylinder and get red hot. This is your ignition. Within two seconds, the compressor vanishes ( now molten metal) shooting upwards burning holes through the building at 6000 degrees F. White hot parts of the machine and building land 300 yards away. The 10" diameter oxygen pipe that used to feed the compressor still has pressure in it from its source and is burning backwards at a several feet a second (like a fuse) spraying mouton steel everywhere. The whole process usually takes less than a minute, but consumes everything near it. Pity any living thing in the vicinity. This is not hyped up or Holywood. This is just one example of many ( albeit in an industrial setting) real world experiences that have happened.
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Never Ever Ever us oxygen to accelerate combustion unless in a device designed to do so. Always make sure anything that can come into contact with oxygen is absolutely oil and grease free. Any never use an oxygen source as a substitution for air. OK off my soap box