Should I remove this leaf? If so do I remove the stem? I treated with neem oil a week ago.
@MaestroTwister are you sure it was a pest issue? Your plant information says the pot is without drainage. This can cause this damage. Sorry to repeat this information if you have all ready checked the soy and roots.
Also sorry to add, with your question regarding cutting the leafs, I would trim of the damage parts. If the leafs are yellow then remove close to the stem. If it’s only partially brown then just remove this as the green will still photosynthesize and create energy for the plant. When new growth comes then I would trim then. Plants are not perfect, but for aesthetic’s then trim the petiole near the stem. 
@MaestroTwister I agree with @Gordo on this.
@Gordo the pot does have drainage sorry I need to fix that information. The soil is not over watered.
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