Advice about my situation?

I’m 14 female so I know i’m not supposed to be on here but I really need help and advice. My stepdad will not stop arguing with me about little things. So yesterday I was recording myself making breakfast for a vlog because I think youtube is cool. And my dad (not stepdad) said that if I really like filming I should do it and get really good at it. My dad is always very supportive at me trying new things. Yet when my stepdad saw me recording he said “why are you recording yourself” I replied “I making a vlog” we said some other words then he says “that’s weird” I ask “what is weird about it?” he then goes on to say it weird that your filming yourself making breakfast. This kinda annoys me so i’m like why do you care? Then we just start arguing. My sister tells me to just leave it alone but to me him saying that wasn’t necessary and if you’re supposed to be my parent then why isn’t he being supportive or like saying something positive. Then he had said that’s the problem with today’s culture you guys find fault in everything. I idk what to think about it. Please give me advice on what to do when he starts trying to argue with me