Reimu seems like an asshole here, and she is, but the reaction she'll have when she realizes her hard-working husband ensures she won't have to worry about money anymore will make it all worth it.

To be fair, if you're proposing to Reimu of all people, you should already know what you're getting yourself into.

If that face doesn't tell this dude "Yeah. She's wild." then I don't know what will.