Is there a phrase or idiom that conveys the "reverse" meaning of sour grapes?
Sour grapes: A good object "becomes bad" if I cannot get it.
Phrase I'm looking for: A bad object "becomes good" if I'm forced to have it.
Say for example that I was forced by a court to fight a boxing match due to some contract and I cannot escape it. I didn't want to do it originally but now that I know I'll have to, I pretend it's all I've ever thought of since I've known the opponent, to take him down in a boxing match. This is where someone would look at me and use the phrase I'm looking for with an intention to deride my pretense.
To be clear, these are my constraints:
The situation or object has to be undesirable all through, objectively.
I am strongly against it right from the beginning to the end (as any normal person, going by the constraint above)
After facing the situation/getting the object with no way out, I pretend that I love the situation or object. I do not actually reconcile myself to it, let alone like it. I only pretend.
The phrase should be used in a pejorative manner