I don't understand why a player coming out and stating his career ambitions is causing such a stink with fans tbh. Each to their own and all that.
It's because those words can very easily be construed as want-away talk. When a player at a club who hasn't won a thing for 20 years says they want to win stuff, it's very easy to read that as 'I want to leave in order to win stuff'. If they want to stay and win stuff, make that clearer in their interviews.
Quotes like these unsettle the fans; soon as a few poor performances come along the fans assume they've given up / they're sulking, player gets fed up, fans get fed up, player asks for a move.
If you're a pro footballer, we all know what you're ambitions are. Just keep schtum and play football.