My boyfriend always jokes and I can't talk seriously with him, help?

my boyfriend is very funny ( which I like) but sometimes I would like to talk with him seriously.. I mean topics like for example hunger in the world.. etc.. but he makes jokes of everything.

When I ask him serious question, for example what does he think about using animals in circus, he always reply joking . I told him 3 times that sometimes I would like to talk seriously with him and he replied .. " yes yes boss" and keep joking.

It is impossible to talk with him seriously, really.

Should I just accept it? maybe most girls would be happy having such funny boyfriend? is this me who is wrong? I just don't know what to do..
My boyfriend always jokes and I can't talk seriously with him, help?
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