Beer theory.

Drink better beer, that's the solution. If you're drinking cheap, nasty rubbish then it tastes foul as it warms up and de-fizzes because, well, it is foul and the cold and the fizz is hiding it.

Also, if you're drinking from the bottle, you mix a bit of spit in every time you take a swig.

Oxidisation will occur but happens too slowly to account for the change in flavour, as pointed out above.
 
Tell him to drink up faster, and backwash less.

That's part of the reason dregs taste nasty, quite a large part of it is backwash.
 
It may have been 'bottle conditioned' beer that needs to be poured gently to leave the sediment in the bottom of the bottle.
 
I'd offer that your brother should stop being a wuss and just drink it, if he drinks faster it won't have the chance to get warm. Although as has been pointed out he is wrong about it turning into vinegar in the time taken to drain a can unless he measures his drinks in terms of days rather than minutes.
 
its would take many days for any oxidation to occur so your brother is wrong.

the petrol thing is completely irrelevant - they are a different class of chemicals.
 
Your brother is a muppet.

Petrol is volatile to a greater degree than alcohol dissolved in water (essentially beer). The time taken oxidise would be significantly longer than its takes to be drunk, unless he has a magical catalyst he produces in his saliva. Spirits do not oxidise rapidly otherwise why would they all not have short shelf lives when you open them? Why are high %proof ones used for disinfection if nothing more suitable is at hand? Why can you set fire to hot brandy/vodka? By his argument you could not set fire to spirits that were warmed so just show him that.

He is an idiot!
 
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