Background: We've been together for ten years, been married for the past five. (We're in our late twenties, early thirties.)
My in-laws disliked me from day one, trying to make it work with them never had the effect my husband and I had hoped for. There have been times they didn't even talk to her son, two to three years in total (petty reasons). My husband always stands up for me, so that's never been an issue between us.

A couple of weeks ago they asked him how we handle the "dog problem" when we're going on vacation. He told them how it is: we always take him with us, usually hiking and car camping.

A few days go by and my husband tells me his dad invited him on a trip to the US, he'll let him pick all the places he wants to go, he'll pay for everything.
We're from Europe and money is a little tight so it's a big thing. 

Part of me now wishes my husband had said no, since they had first asked about the both of us...and their "solution" is to invite him only instead of finding something suitable for our situation?

Now for the stupid part:
I wouldn't even have wanted them to pay for anything anyway, I would've probably declined any offer. We don't get along, I am simply not the woman they would've wanted for their son.
They weren't there when their son needed them, he had to take a student loan (which we're still paying off) because his dad didn't feel it was his obligation to support his son who's the first academic in his family. My in-laws aren't filthy rich but they're quite well-off. It's their money and they shall do with it whatever they please. 
Offering my husband a trip that'll cost them a couple of thousand Euros after they have just recently re-established the connection (after a year of silence, see above) just gives me a weird feeling, besides being kind of hurt because he accepted without hesitation.

His mom has been spoiling him ever since they're in touch again, too. She sent him several three-figure amounts of money for Christmas, his birthday etc. It's a little much and unusual. 
I'm all for loving parents but I'm afraid they might hold it against him some day.
His whole family is messed up because of money - e.g. his dad and uncles don't talk anymore because of their dad's heritage.

Am I the asshole for not being able to be thrilled about the whole thing?



Tl; dr: My usually cheap in-laws invited my husband to an expensive trip to the U.S. and I'm having a hard time feeling happy for him.