Bloomie is what? Right wing? The issue is left wing.
The "issue" (soda cups) is neither left-wing nor right-wing.
Words have meanings. "Left-wing" doesn't mean "everything I don't like".
Let me explain the meaning of these particular words. It seems that in a national sense liberal democrats are defending Bloomie's agenda and conservative republicans are against it. That makes it ...duh...a left -right issue.
Who are these liberals that are defending Bloomberg "in a national sense"?