Sibling dynamics are always complex, and there’s no doubt that different personalities can clash inside a home.

But in this story, one sister uses being on the spectrum as her raison d’etre… a jerk.

Let’s look into this diagnosis.

AITA for telling my autistic sister to stop using her diagnosis as an excuse?

I (25) have a younger sister (21) who was diagnosed with Asperger’s when she was around 16 or 17, though now it’s just referred to as being on the autism spectrum.

She’s high-functioning but lately, she’s been really getting on my nerves.

Well sure, even people with disabilities can be annoying.

If I ask her to do something (like emptying the dishwasher), she’ll put it off for days, then yell at me when I remind her, saying that I do the same thing.

I’ll admit I don’t always do things immediately, but it’s not the same.

She also drives, but only around a three-mile radius between home and work.

While I understand not being comfortable driving far, it bothers me that she expects me to drop everything and do things for her, especially since she’s capable of more than she lets on.

Hm, maybe this little sister is exaggerating her difficulties?

For example, when she wasn’t driving, I’d often wait for her after work in the parking lot, sometimes for 20-40 minutes, because she’d forget to tell me when she was done.

When I asked her to send me her schedule in advance, she got upset, telling our mom I was being unreasonable.

I don’t mind picking her up, but it’s frustrating when I’m not even given the basic information.

At the very least, she’s a tattletale. Not a good look for a grown woman.

Not once has she offered to pay for gas, especially when I’d have to keep my car running in freezing temperatures.

She’s also incredibly stingy with money.

If she’s having a bad day, I’ll sometimes pick her up lunch or a treat, and I never ask for anything in return.

But for my birthday, she promised to take me out for a drink.

Five months later, no drink, and when I asked, she said, “I bought you a donut last week.”

That felt like a cheap excuse to get out of spending money on me.

Donut tell me a donut and a drink are the same.

I was upset because I do thoughtful things for her regularly, and this didn’t feel like a genuine birthday gesture.

She didn’t even acknowledge that it was an attempt to cover her promise.

She also didn’t buy anyone in our family Christmas gifts but spent over $4k on a convention with her friends.

When I confronted her about this, she said she finds spending money anxiety-inducing, but then used her autism as an excuse to avoid keeping promises—whether it’s chores, money, or anything else.

This sister always has an excuse. Justified or no?

She’s constantly judgmental about things like my future dog choice or my car, always trying to put me down in small ways.

I called her out on it, and my mom sided with her, claiming that she processes things differently because of her autism.

It’s frustrating because while she claims that her autism makes her socially awkward, she definitely knows how to push my buttons.

I finally told her she needs to stop using her autism as an excuse to be rude and inconsiderate.

What do we think? Is big sister being bad?

Now, she’s even worse, and I’m starting to feel like I’m the jerk for being frustrated.

AITA for feeling this way?

Let’s check the comments.

One person says autism isn’t her only diagnosis.

Someone else says, maybe think of alt solutions?

This poster says, the solution is right there…

Another person with an armchair diagnosis.

Someone else says, you should both grow up.

Autism is tough, but it’s not an excuse for bad behavior.

These sisters need to have a come to Jesus.

If you liked this post, you might want to read this story about a teacher who taught the school’s administration a lesson after they made a sick kid take a final exam.