I doubt very much that the offer puts him in line with our very best players. And I don't understand this demand for loyalty - the club will offload a player if it wants to, drop them from the squad, not offer them a new contract, release them, no one talks about the club throwing anything back in their faces. He was given a contract which the club determined would be of a specific length, their choice to do that, and he has decided to honour that contract and no more, which he is perfectly entitled to do.
But it's only a certain sub-set of fans that have decided he's sulking, based solely on his not signing a new contract. The same with playing within himself - Wilder obviously doesn't believe that and knows a lot more than fans watching 90 minutes of a team that's out-of sorts and failing badly. The "stat padding" is spurious conjecture from a couple of people on here and has suddenly become fact. It's complete nonsense. Any club that wants to sign him can watch almost every match he's played in and won't buy him based on a few meaningless numbers.
He has shown himself to be a player of only limited capabilities, but people are turning that into all sorts of nonsense based only on the fact that he hasn't signed a contract, which seems to have had the effect of a deeply personal affront to some people.