A source tells PEOPLE that, while "Kim is a very supportive wife" and "rarely complains," she's not a fan of the social media sagas.
Though Kim keeps a level head about most of her husband's eccentric behavior, says the source: "What causes friction in the marriage, however, is Kanye's compulsive tweeting. Kim can't stand it. She is all for self-promotion, but doesn't approve of Twitter drama."
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According to the source, Kim, 35, was particularly upset when Kanye slammed his ex Amber Rose during his feud with Wiz Khalifa. (For background, Wiz Khalifa and Rose are also exes and share a son together. During the back-and-forth with Khalifa, Kanye bashed his ex and mentioned her son Sebastian, 23 months, with Wiz Khalifa, tweeting, "You wouldn't have a child if it wasn't for me," and "You own waves???? I own your child!!!!")
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"She was very mad about Kanye's Amber Rose drama," the source said – and indeed, Kim went on to initiate a reconciliation with Rose herself, and a source told PEOPLE at the time it was because "Kim is a mom and wants to be a role model. She doesn't want to be involved in ridiculous drama." (Shortly afterwards, the two rappers went on to settle their differences, too.)
As for how she feels about the long-simmering Swift tension – which erupted after West rapped that he "made that bitch famous" on a song on his new album, then taking to Twitter to defend his lyrics about the pop star – the source said Kim "doesn't care about his song lyrics."
Added the source: "The album is getting tons of attention now, and this was the plan."
And ultimately, "their marriage seems fine," explains the source.
"Kanye has been very busy, and Kim is very understanding. Kanye is great when he is around."