My (F23) partner (M25) and I have been dating for a year and known each other for almost four years. He has a fraternal twin brother, let's call him Jake, who makes a hobby out of making jokes at my partner's expense at times. I previously asked him privately about why does he tolerate these bs and he told me how his Jake means no harm is quite insecure since high school so he that's his way of coping if it makes him feel any better. For context: they look nothing alike. My partner is extremely good looking, tall, maintains a fit and healthy body so I guess he is considered conventionally attractive. I met his other family members too and they are all very friendly and sweet. We visited his family for the labor day weekend and had many fun activities together. Jake arrived right around dinner to join us and started making some weird lame jokes again. Some of which were like "Your new job must have hired you for your pretty face cuz with that degree (his college major) you would end up unemployed for life." "Pretty people often have room temperature IQ and you're not beating that allegation bro" after my bf accidentally dropped and broke his cup. I was getting so annoyed so I replied "you have never broken a thing in your life, einstein?" He then goes "chill I was just joking" to which I replied "well I don't know who exactly told you comedy is your forte but it's a good thing you're professionally not a comedian. Cause if that was the case, I would definitely suggest you to look into other career options." His parents got all quiet and their younger sister laughed at this. Jake started arguing with me and told my bf to "control his woman" I told him since you do not have a woman to begin with, it's probably hard for you to realize that women are not objects or toddlers to be controlled. His mom told both of us to calm down and asked Jake to apologize for his last comment. My partner just picked up our stuff and said we are leaving. He told his brother on the way out that he is fine with being butt of the joke but never cross the line by attacking me or even think about saying anything disrespectful. Since last night, we have been getting mixed reactions from family and mutual friend groups. Some are saying it was between the brothers, I shouldn't have gotten involved. Some are saying everyone knows how insecure Jake is about his looks and we just came off as a bully further crushing his self esteem.