What brand of beer has been the worst rated most times?
brand of beer refers to BrandName; worst rated most times refers to MAX(COUNT(StarRating = 1));
SELECT T1.BrandName FROM rootbeerbrand AS T1 INNER JOIN rootbeerreview AS T2 ON T2.BrandID = T1.BrandID WHERE T2.StarRating = 1 GROUP BY T1.BrandName ORDER BY COUNT(T1.BrandName) DESC LIMIT 1