just don't eat the meat.
No biggie. I doubt they only eat meat.
If you took all the potatos, vegetables, soups, curried stuff, samosas, naan bread, carrot loaf, beans and fruit and ice creaml waffles and scrambled eggs and pasta and rice off their plate, they'd be pretty pissed off.
If your mother treats you as a joke, then treat HER as a joke.
Im sorry but you have every right to scoff at her too.
Buy lentils and dried chickpeas and other dried beans, really cheaply. Then soak them, for a day, then boil up, add soysauce, some frozen corn and sweet green peas, some baked chewy tofu or baked pumppkin with greated cheese or walnnuts on top, they'll be delicious and your family will smell them too!
You're 15, not a baby, ask your mother to buy you four packets of firm tofu , some chickpeas and fava beans, and a pumpkin. If she "forgets" again, push the meat off your plate if she gives it to you and say "oops, forgot my manners."
They can't disrespect you like this.
Otherwise, go to the store one time, for an easy shop, and buy anought food for a week.
Ask your mother for $30 and ask her to not buy you food is all she can do is forget, and buy your own:
It is nothing to do with wether they take you seriously, just do your own thing and don't ask them for permission.That is like asking them to mock you.
Just eat YOUR food and take some reading material to the table, if you are required to sit at the dinner table.
However, if they still tease you, take your plate of nice food, and eat it somewhere you are not subject to harrassment.
I have absolutely NO patience for sarcastic family members.