So, I actually have a few things that annoy me that people complain about.
First of all, my collie is in perfect health for her age with one exception, she has a skin condition which makes her skin dry, and causes bald patches in some areas. We constantly give her moisturizing baths (for god's sake we spend an extra 25 dollars at the groomers for her special treatment) and maintain it really well! But whenever someone sees her they're just like "oh my goodness what have you done to her? She looks so mangy? Why are you neglecting her!!" Like geez, its not like we spent hundreds of dollars to get her tested to make sure it wasn't something that was going to kill her. Spoiler alert, she's perfectly fine.
Next, when people think its okay to just pick up my other dog. I have a Bichon, and yes, she's an adorable marshmallow, and yes she wants to say hi to you. But please don't just bend down and pick her up and start fawning over her??? Like I had a complete stranger ask to say hi to my dogs, and in order to get away from my collie (who just loves saying hi to people too!!) she PICKS HER UP and starts petting her. First of all, its not your dog, you don't know anything about her, she could bite for god's sake! (she doesn't, but honestly how would you know??) Second, since she's still in training, I don't want her just being rewarded for misbehaving (which she usually does by tugging at her harness to say hi to people) Third, its so rude of you to just assume its okay? How would you like it if I picked up your kid out of its stroller and just started fawning over it?
And finally, when people tell me my cats are out of control. Especially when: A) they don't have cats, B) they had a cat and now think they're experts, or C) Compare them to other cats. My cats are eccentric, there's no denying that. They run around, they play fight, they make noises, and yeah, sometimes they knock things over. But first of all, two of my cats are barely 2 years old! Of course they're gonna play a bit more than say my 9 year old cat. Second, my cats are super well trained! They know not to jump on counters/tables/etc, not to scratch on things that aren't their posts, and even come when they're called! I'm shocked when people tell me they're out of control when they see them running around the house, or meowing/making noises to get my attention. Literally leave them alone they're babies.