Cite your source.
No such source exists.
There are countless Calvinists that would laugh in your face and tell you that God is not be effected at all, even by love.
[W]e (correctly) deny that God has passions; The passion of love is something that happens to us, as "getting ' happes to a body: and God is exempt from the 'passion' in the same way the the water is exempt from 'getting wet'. He cannot be affected with love, because He is love." C. S. Lewis, Miracles (New York: HarperOne, 1996), page 148
The above citation related directly to the specific doctrines of Divine impassibility and divine simplicity, both of which are derivatives of divine immutability.
This, in three nearly synonymous sentences, is the biblical teaching about God not changing. IT IS NOT what the doctrine of immutability teaches. It's not even 1% of what it teaches.
"The immutability of God is that perfection of God by which He is devoid of all change, not only in His Being, but also in His perfections, and in His purposes and promises... there is no change possible in God in any respect; God is free from all variation, not only in His essence and attributes, but also in His knowledge and will. This excludes not only all quantitative and qualitative change, but also all change of place, and all succession of time in God." (Systematic Theology, pp. 58-59, emphasis added).
Saying doesn't make it so.