If I leave a napkin on a plate or a wrapper on the counter I hear about it.

If I see that someone else did something similar, I pick it up and throw it out.

Yesterday evening I find a half eaten rice pudding, the foil top and dirty spoon on the counter. 

This time I decided to perform a test. I confronted my sister and asked why she couldn’t clean up her mess. She replied saying, “are you fucking serious?” I said, “well yeah, the trash can is like two feet away.” I walked back to my room and shut the door. 

Seconds later, I hear my mom saying, “that’s pretty petty.” I exited my bedroom only to find my mom and sister standing in the kitchen looking very upset with me. 

I asked my mom what was so petty. She said, “you going to your sister and asking why she left some trash on the counter. What’s the big deal?” I replied saying, “honestly, it’s not a big deal, you’re right mom. The big deal is this though, how come if I say the same thing to her that she says to me, it’s considered petty?”

In other words, when I leave something out I shouldn’t have, not only do I hear about it from sister, but then mother as well. Things they will say are the following:

Don’t be a slob
Clean up your mess
Why am I always picking up your trash
Mom, mom, why do I have to clean up after your son?

My response to any of those is always the truth. That could either end up being me saying I’m sorry or something along the lines of, I fucked up, my bad. 

So, Reddit, other than this being completely juvenile, what’s your take

Why am I a bad guy when I leave something out but she’s not when she does the same?

Why am I a bad guy when asking her to clean up after herself, but she’s not when she does the same? 

By the way, I later mentioned to the both of them that the only reason I mentioned anything about this was because I was curious what their response would be and that I predicted exactly how it went down. I simply want to know why I’m always wrong and she’s not when doing the exact same thing. 

After they heard this, now I’m told I’m childish, I’m playing games, who does that?

Reddit, I can’t begin to explain the toll this is taking on me. Please help.