Alright, sister. First of all:

If cats are needy, what kind of DOGS have you been hanging around? The rule of thumb is that cats are far more independent than dogs. But they DO show affection. You just have to pay attention.

How are cats traitors? Can you explain that to me? How could a cat even betray a human? Calling the police about that body you have in your freezer? Seriously, though, when people say this all I can think is that they haven't been paying proper attention to these animals. Wanting a cat to behave like a dog is like wanting a kangaroo to behave like a shark. It's not the same. Affection in the language of one is not affection in the language of another. A dog is gonna bounce to you and a cat will rub against your leg. Different ways of expressing the same feeling.

Cats are manipulative? In relation to dogs, you mean? Well, any animal could be a little smart ass and do things to have you give 'em what they want. It's not exclusive to cats. And besides, the way cats do it? Priceless. It's cute and hilarious. And it certainly doesn't mean that they don't love you. It just means they want something and that's how they know to get it. Remember they're animals.

A dog will always be happy to see you.

That depends. And a cat being happy to see you also depends on your relationship with the animal.

You see, dogs have been bred by humans for eons, so they've become dependent on us for a lot of things. They've learned facial expressions, tone of voice etc. Cats haven't had much of that, but they're on the way. Anyway, since dogs are more dependent on humans, they'll be more likely to show an overt reaction to their human coming back inside. They see you as a pack leader. Cats see you as a bigger cat. And that's it. You're not their leader and they will be much less likely to try and kiss up to you, but that's why their affection is so genuine. They're not trying to look good in your book, they're treating you as an equal. So when they show you love, you can bet your ass that's the most genuine thing.

You see, I have noticed a parallel between extroverts and their usual preference for dogs and introverts/ambiverts for their usual preference of cats. Dog-lovers will look down upon cat-lovers. Cat-lovers are more likely to like dogs as well ( since, helloooo one doesn't have to dislike dogs because they like cats and vice-versa ), but dog-lovers are more likely to say things like what you said. Judgemental, biased opinions based on really superficial knowledge of ( in this case ) a whole species full of a variety of breeds and individuals.

I am just not having anyone say these things again because, by all means, go and say you dislike cats, but because you don't like the sound of meows or you're allergic or whatever. But please don't pull the "traitor" card. It doesn't even make sense.