Rudy Giuliani says his feelings aren't at all hurt he got BOOED ON HIS BIRTHDAY in Yankee stadium ... telling TMZ Sports the boo birds are a sign of affection in the Big Apple.
"I know Yankee fans ... they boo you when they love you," the former NYC mayor tells TMZ Sports.
@Yankees fans boo @RudyGiuliani on his birthday pic.twitter.com/e6FeFxk2FH
We got RG out in D.C. and he told us he wasn't bothered by the booing one bit. He even laughed about it!
The good news ... ex-Yankees star Johnny Damon still has his back -- and told TMZ Sports why he'll always get love in New York.