If you find yourself in deja vu on the regular with you child fighting the same battle over and over again, it's a sign that you are in a struggle where no one is winning. When children repeatedly have upset over the same thing, it helps to look beyond the present situation and ask yourself a couple of questions.
1.) What are the conditions that may be affecting the child's ability to cope? For example, does it have something to do with how tired or hungry the child is at that time of day? Are the child's objections related to sensory sensitivities? (Remember, Children are a lot like houseplants...they do best when the conditions are right)
2.) Is this a hill worth dying on? Is the situation about something really important and necessary? Sometimes it's worth backing off and giving the child a few weeks or months to mature and reintroduce the stressor again later.
3.) Is there a way to make the hard thing a little easier? Can you "lower the bar" -- Increasing support and safety often helps a child deal with un-preferred stressors, and they become more independent and able to deal with things better after some success.
4) If the un-preferred stressor is something unavoidable, the most help you can be to your child is to let him/her know you understand how they feel, and you will be with them while they are sad and upset about it. It's ok for your child to do hard things, and it's necessary for them to be upset and unhappy about things sometimes. You can let them know, too, that while it's ok for them to be upset, they have to still behave in a way that does not hurt or disrespect other people or things around them.
If you have a situation at home that keeps getting everyone in a tangle, and you'd like to talk about it, I'd love to put our heads together to understand your child, and come up with some solutions that work for your family.