So, basically, you're doing to your husband what Clark Griswold's boss did to him in "National Lampoon's Christmas Vacation" - except, instead of a "Jelly of the Month" Club, he's getting $2,000.
Perhaps your DH has come to expect your bonus & had plans for what he assumed would be his "portion"?
DH & I have been married for almost 23 years. And, for the length of our marriage, DH's & my finances have always been combined, & we've always made any financial decisions together. So it's hard for me to relate to your situation, OP. I wouldn't even feel right spending money on concert tickets for just myself, & neither would DH.
Right now, I make zero, but DH has never made me feel like the money he earns is more "his" than "ours". He gets an annual bonus, & I usually have that money spent 6 different ways to Sunday.
Anyway, I don't think you're necessarily wrong for wanting to spend your bonus on plastic surgery for yourself. (I've actually thought of doing the same sort of thing for myself - I think they call it a "Mommy Makeover" - w/ DH's bonus, but there are always usually other things we'd rather have w/ the money.)
However, if I were you, I'd talk to your DH & try to find out why he's upset w/ your plans. Even if a husband & wife keep their finances separate, in the end, marriage is still a partnership, & partnerships work best when there's communication.