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TIL those cute little dogs are aggressive huh
I would be aggressive too if creatures 30 times my size were always trying to touch me and pick me up >

They do not shut up either >

That was easily trained out of my rescue chi. They are very smart and easy to train. I had a sheltie once that was impossible to quiet down. >

I have an uncle that has one and he’s tried everything to make it stop barking all the time.  He was the dumbest dog I’ve ever seen >

Most are not aggressive.... they are fearful because the entire world is bigger than them. Their barking is a warning & a reaction to protect themselves. Most toy sized dogs are people/dog selective, again because they are small & they are essentially defending themselves. Any dog, no matter the size, that makes contact with a person with their teeth should be considered aggressive/reactive. Unfortunately, owners of little dogs often allow them to behave inappropriately because they are little & they can just scoop them up. Dogs learn they can misbehave & get what they want from their people.
ETA — as a dog trainer that has worked with a lot of bully breeds & aggressive/reactive dogs I will add the worst bite I have ever had was from a mini schnauzer (still have the scar). The owners (contacted me about leash behavior) were offended because I showed them the bleeding bite on my leg & told them their dog’s behavior was not appropriate. They did not hire me & wrote a ridiculous review. Good luck to those people....
eta more — I should add we met in the park, the dog was on leash with owners & while we were talking he went after at a little girl running by so I stepped in front of the dog & got bit. >

Do you not see the difference between an 8 pound Chihuahua biting your arm and a 70 pound dog biting your arm >

Sure there's a difference of course but people expect me to train my 70lb dog (which I do/did) but don't GAF if you don't train your 5lb dog that is a total asshole.
Then if my dog ate yours because it's an asshole guess whose dog will be called aggressive ? Not your aggressive pocket pet. >

My Chi is not agressive... 
However... I do see your point a bit. For a while she learned that if she yapped people (not me) would find it adorable and pet her. So she would yap at people for pets - and it would work. I realized this eventually and now it's a race - DON'T PET THE YAPPING CHIHUAHUA!! >

Yes there are no bad dogs just bad dog owners and there are no aggressive breeds only idiots think there are