![Yotsuba&](https://i.stack.imgur.com/DQ2X9.png)

Googling around for that particular phrase pretty much leads only to a song
これくらいで歌う or it's use with の as in これくらいの塩で充分だ. I have a sneaking suspicion it
may be related to the adverbial usage of これくらい, but not entirely sure.
CC BY-SA 3.0
2014-11-22T01:10:17.927
19627
2014-11-22T06:03:52.530
3896
question
particles particle-で
「これくらいで」 whats the grammatical purpose that で has here?
Among a series of definitions of particle で, which you will find in your
dictionary, this is a **で denoting reasons / causalities**.

Your example, though the wording seems to be kind of culture-specific and I
find it hard to traslate, may roughly mean something like "It' funny she is
acting like a senior only for _these reasons_ " ( _these reasons_ depending on
the context) or similar.

Another example:

> [試合]{しあい}は[雨]{あめ}で[中止]{ちゅうし}になりました。 The game has been called off due to the
> rain.  
>  これくらいの[小雨]{こさめ}で中止にしてほしくない。 I don't want it called off just for this light
> rain.

If you skip "light rain" from the latter then:

> これくらいで中止にしてほしくない。
CC BY-SA 3.0
2014-11-22T02:32:22.857
19629
2014-11-22T06:03:52.530
2014-11-22T06:03:52.530
7667
7667
19627
answer