Beer skunks because it is exposed to UV light. The light reacts with the hops which break down and then recombine to form acids. Thats why most bèers come in a brown bottle. Only brown glass blocks UV rays.
If getting beer warm skunks it brewers couldn't Pasteurize beer. Pasteurization is done by heating the beer to about 147° and holding it for about 7 minutes which kills any bacteria.
I used to build Pasteurizers for a living and they were used by breweries around the world.
Regular Bud is about 5% and. Light about 4.2% and Ice about 5.5%. Natural Light is 4.2% and Natty Daddy is 8% if you can stand to drink it.