The only one thus far to turn my stomach was 4Noggins Weybridge.
There have been plenty of tobaccos I've disliked, but Weybridge was the only one I've hated.
I'd strongly dislike any cigar leaf blend, as well.
I recently dumped out my first bowl of Crooner, half way through, and re-homed the rest of the ounce to somebody here. Strongly disliked it.
The batch of 515 RC I got may have been over-sauced with vinegar...it had way, way, way more vinegar going on than McC 5100 ever did. I'm ok with hint of vinegar, but this was insane and I strongly disliked it.
Dunhill 965 struck me as the most one-dimensional piece of leather I'd ever smoked, even back when I was a full-bore English guy. I was all about latakia blends, back then, but 965 tasted like licking a strop of leather, with absolutely nothing else going on. Wound up very turned off by it.
Finally, I'd just mention whatever the common denominator is in run-of-the-mill, store-branded aromatics in bulk jars on B&M counters. They all smell like playdough to me, now. Kind of hate it.