She's not asking you to do anything unreasonable.
Hold a fork properly. Put some of your dirty laundry in the wash.
Etc.
Your parents are not asking you to do these things because they want to irritate you, but because they're trying to get you in the practice of living more like an adult in anticipation for the day that you one day move out of home.
And yes, while you live under their roof, they do call the shots. Your mum may have done everything for you in the past, but you were also a child back then. Are you still a little boy, or are you an 18 year old man now?
How maturely do you think you behaved when you were doing sarcastic impressions at the table and kicking up a fuss about the fork issue?
Don't you think that a man shouldn't have to be reminded how to hold a fork properly?
Soon enough you will be living independently, and there won't be anyone to ensure that your laundry is organized, that your room is clean, that there is food on the table or that all the banking is accounted for etc. So at what point do you start doing these things?
Its a bit late to start making a proper effort only after you've moved out (and this is a major common reason why so many people struggle with moving out, finding it completely daunting etc).
Your parents don't want you to struggle with independence, they only want the best for you. They've worked hard to raise you, they love you and you love them. Its time to start putting in more effort to make them feel like they've actually raised a man (rather than a man-child).
One day you might even find yourself at an important business lunch in a fancy restaurant about to land a huge profit business deal, and as you watch the other businessman sign the contract, you may find yourself feeling a little thankful for those times your mum made proper dinner table etiquette second nature in you (instead of being that guy who automatically slumps on a chair, picks his fork up wrong, is totally confused by the array of knives/forks and generally acts like a fish out of water in the restaurant setting etc).
Maybe you can even get a girl on a date to think that you're actually a really classy up-and-coming success story kind of guy (and later make her father think "Yes, this is the kind of guy I want my daughter to go out with').
Impressions count.
Also: Never leave someone you love on an argumentative note. Life can be fleeting, and you may seriously regret your last words to someone if something terrible happened to them. My own parents had an argument with each other one day and the next day my father had died in a tragic accident. If losing her husband (who she did love a lot) wasn't bad enough, living with the fact that their last words together had been ones said in argument, made the devastation even worse.
Don't take for granted your folks. If you love them, let them know it.
Apologize and focus on having better communications with your parents. Identify the sources of conflict and see if you can both deal with such situations better (so that it isn't repeated anymore). There have been wrongs committed on both sides (and you know where you went wrong). So have an adult conversation about it. Even if your parents aren't particularly compromising, you need to realize that what they've been asking you to do is not unreasonable/terrible either.