assalam alaykum sister
If the sister feels that this is not just a phase that the husband is going through, due to some issue, like he just lost a job or something of the sort, if it is his general nature not to be respectuful, understanding the sister can take it in gradual steps.
The sister can approach her husband when they are both calm. (she needs to be clam too so she is in control of her emotions and things do not blow out of proportion). She needs to try and explain to her husband the difficulties she is going through,with an aim to get him to feel with her.The sister needs to keep in mind that he may not intend to hurt her, although he is.The husband might not be aware how this is affecting her or the way he was raised it was not part of his upbringing to be cooperative or understanding and maybe the way he speaks which the sister finds offensive, he may percieve it as normal.
If it helps getting your thoughts on a piece of paper or email, reread what you've written so it is not full of accusations, but balanced. Try mentioning all his positives, and show your appreciation, then go on to his shortcomings and show him how it would make your love grow deeper when these issues are worked at.
Give him time and praise every little effort and positives. Although it may not seem much, but it is the way forward and would get him encouraged to continue.Do not despair quickly, but if the sister feels that she had given things time and effort and there is very little response , then it might be an idea to get a trusted person who could have a quiet word with the husband. To reflect to him all the good things that they see in the marriage and point out that it would be a great pitty to see things deteriorate.
The sister could also allocate a special time to read quran and hadiths with the husband. It is advisable that she does not go directly to the issues that mean a lot to her, so this session does not turn into each side pointing to the others shortcomings and it becomes argument time. Rather the sister needs to aim to make this a peraceful time and the couple are bound to indirectly come across ayat and hadiths that remind each of them of their responsibilities to each other, soften their hearts to one another and create a greater bondage, as this is a sesssion when the angles are present and Allah's blessings and mercy will be bestowed on them. May Allah restore peace and harmony in their marriage.