哈利波特一 第一句话写的："Mr.and Mrs.Dursley,of number four,Privet Drive

哈利波特一 第一句话写的："Mr.and Mrs.Dursley,of number four,Privet Drive,were proud to say
that they were perfectly normal,thank you very much."
不太明白这里的thank you very much是一种什么语境下说的.