No, he wasn't.
Just because Maca took some unimaginative, mk 1 mod 0 pot shots at America's favorite political whipping boy is no reason to get one's panties in such a bunch as to discredit or malign the achievements of one of the greatest musicians, composers, and performers of the past 100 years. To call McCartney the "bubblegum" of the Beatles is really uninformed and dismissive. The man wrote Hey Jude. The man wrote Blackbird. His throw-away tunes and D-sides, let alone B-sides or C-sides, would have made the entire careers of other musicians.
And even at age 68, Maca is a dynamo on stage. Rock on, Paul.
Sorry, but you are just wrong. Paul McCartney has written some great pop tunes, but every single song he’s ever written is bubblegum, empty of any deeper thought than “love, love, love.” McCartney is a mile wide but an inch deep.