Meaning of いなくもない


I am not sure about いなくもない in the following sentence:

「私の尋ねていることにちゃんと答えなさい」と腹をたてる人もいなくもない。 I guess the meaning is that people react
pissed when someone tells them to just answer the question(s), but I am bit
unsure about いなくもない.

Does it mean something like 'sometimes people might react angry when they are
told to just answer the question'?




The meaning of the sentence is approximately the opposite of your
interpretation, namely

> Some people get angry and say "Answer my question properly"

いなくもない means something like "it's not that there isn't", or more idiomatically
"there are some".

I think what confuses you about the meaning of the sentence is と. Here it is
the quotative particle, not the if/when と. If you wanted to convey your
interpretation, one option would be

> 「私の尋ねていることにちゃんと答えなさい」 _といわれると_ 腹をたてる人もいなくもない。

