Dealing with a negative family member…or a person who just likes to put you down

Hi all,

Here is a thing I’ve been dealing with my whole life. I am the youngest of three brothers and my middle brother constantly craps on anything I do and has to berate me in front of anyone as much as possible. I’m a pretty laid back dude but he has always gotten to me. So, I recently got a Mopar A Body for a restoration/cruiser project. He has always considered himself the mechanic of the family, even though we have an uncle and cousin that do that for a living. We are in a group chat with my uncle and we’re talking about current things we are in to, and I posted a pic of the car I’m working on and my brother immediately talked me down and said I’m gonna learn what it takes. I’ve started projects before, just not Mopar. He called me out for this car being my first and “I’m gonna learn, tearing them down is easier than building them up” which I do agree with but didn’t like that he had to jump himself into a thread he wasn’t apart of. Me and my brother were talking about the project a few minutes before I posted the message and he didn’t say anything like that to me. Am I being a brat that I’m mad at him for talking crap? I know this is more of a working on cars thread these issues(not just car stuff) have been bugging me for years.