Yes. When he doibted her because he assumed she had a relationship with his cousin before their shaadi. When there was an issue with Naksh & Naitik called her a bad mother. Also when she supported his sister to marry his best friend against the wishes of his family. Sab main the ML has insulted or berated the FL in some form or another.
For that matter even in gen 2 Karthik ne kitni baar Naira ko insult kiye - shubham ke time pe, when MG ka accident hua are some of the examples of the top of my head. I am sure there are many many more
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