Do you understand mutual exclusivity?
Winston can have both produced 16 points in one quarter, and have been lucky to not have thrown 4 interceptions in less than a half of football.
the two things are not mutually exclusive. You may not like that he said "He's a bad QB" because I do not necessarily agree, but the dude throws a LOT of interceptions.
Just because he also throws a lot of touchdowns, doesn't make his proclivity to throw interceptions any less true.