AIO Fiancés parents want say in my wedding

My finances(19m) family can be really nice or complete drama there is no in between. Lately we have been talking about the plans for our wedding I (ftm 18) will be wearing a gothic red and black suit. They are insisting I cannot wear a suit or red. I’ve told them repeatedly it’s what I am going to wear and it’s not really there choice but they keep badgering me and my fiance. I told them the other day if they continue to tell me how my wedding will go they will not be invited and we will get a JP. They screamed at me and said I’m taking there son from them. AIO? Edit. I’m not asking for anyone’s opinion on the marriage as we are not getting married for a few years but it’s been a topic of conversation. We have been together for 5 years now and living together for 2. We know each other very well. My fiance stand up for me in these situations but they won’t stop