"Disgruntled fans" refers to people who are unhappy or dissatisfied because they feel let down, disappointed, or frustrated by something related to their favorite team, artist, or entertainment. Full definition
However posts left by disgruntled fans on the announcement expressed disappointment that it was «selling out,» to big business. (thedrinksbusiness.com)
seems like everyone is at it including those meant to be in your corner — it's mr anonymous» cheap attempt at winding up disgruntled fans with more bull ****. (justarsenal.com)