Thoughts please

[Okp12]

I'm new to this, but have been a step mum for 7 yrs now so class myself as fairly experienced but my son and my step son are the same age (12) go to same school but are very different to each other but growing closer with age and having common interests my step son is a handful and my son is easy going. Occasionally my step son will put my son down or be little him or make fun of him this bothers me more than my son , my step son calls it banter and "joking" should I be concerned ?

Honestly no. Biological siblings do this too, it's perfectly normal. My brother and I love each other to pieces but even as adults we insult each other and wind each other up... never with malice, it's jokingly done.
I think it's only an issue if your son perceives it as such. If he's bothered or upset then it needs to be tackled, if he doesn't care then it's a non issue.
Also everyone thinks their own child is the easy going one and the step kids are harder work because they're not yours so it doesn't come naturally.
I thought my DCs were so much easier than my SCs like it was a fact until my DP pointed out that he felt the same about his DCs and thought mine were hard work! It's subjective.
Don't give your SC a hard time if it is only "banter", more kids of that age tease each other. As long as there's no deliberate attempts to upset or belittle your DS then it may just be you being over sensitive for your baby (we all do that at times, it's not a criticism) xx

That's really useful to have someone's else's opinion I can be sensitive especially towards my own thank you.

Okp12 we all are when it's our babies, sounds like you're a lovely normal mum

As a dm of adult dc this sort of banter does stand them in good stead for later on on life!! Dd is the oldest and dealing with 8x db has meant she takes no crap from men!! The ds all get on despite the battles of childhood!! Unless it is obvious bullying just keep a physical distance but ever open ear!!

Totally normal. Me and my brother used to be quite mean to each other, taught us how to stick up for ourselves and how to take a joke/banter.

All siblings I know have done this too, my 3 brothers done it all the time.