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You might be french but you also need to understand what have been said before laughing. The butler didn't say rose=mon chéri he said that the "kind of rose" (new variety) in the greenhouse were called mon chéri.
http://www.mangago.me/read-manga/jounetsu_no_english_rose/tr/119961/page/14/
FACT: ‘Mon Cheri’ is a Hybrid Tea rose that was introduce in 1981.
euh! i don't know where they heard that a rose is called "mon chéri" in France lol I'm French and it's the first time i hear that XD
A rose = love ....... and in french une rose a pour siignification l'amour mais ça reste une rose ahahah!