It is a bottom yeast, and bottom yeasts have that effect on some people. I used to get a nearly instant headache from drinking Bud myself. After not drinking any Bud for about 10 years, I discovered that it no longer has the same effect. I'm presuming it was me, not the beer, that changed.
I've had a few beers that are just gawd awful (to me) and tasted like they were spiked with formaldehyde (some places they were) or tasted metallic. I avoid those now like the plague.
I've also had some egregiously bad, amateur brewing, microbrewed beers. Many people fawn over any and all micros, which I suspect is more psychological than pallet related.
It’s definitely not the bottom yeast. I can drink Sierra Nevadas just fine and they love them some bottom yeast. It’s probably not even the rice, which is really more a lame practice than anything else. It’s probably preservatives and other junk. I keep meaning to tag back up to the world of Bud now that Inbev took them over, wondering if they’ve gotten better. But there’s so much other beer out there I know is good I never get around to seeing if a known bad beer may have gotten better.
There are some definitely bad microbrews out there. But I respect them for trying new things. Even my favorite company, New Belgium, has a couple of stinkers, but I’ll always try a new one out of them because they hit more often than they miss.