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"Valid means having a sound basis in logic or fact; reasonable or cogent."
Like many words, "valid" has more than one definition - one of them being "justifiable," so right off the bat your argument fails.
WTF does feelings being valid even mean?
Feelings just are. 
You have them, and there's a reason, whether it be hormone imbalance, relationships, memories, logic, etc...
Then you choose what to do with them, whether it be look inside, or take pills, talk about it, act on it or even doing nothing.
But WTF is this valid shit? >

I think where the OP gets it wrong is that they are trying to fit every worldly thing into the binary thought process of rightness or wrongness. This constant focus on whether something is right or wrong obscures the experience of life because it makes us think that everything we say or think is somehow tied to whether our character is “good” or “bad”. With a few exceptions, most things in life exist on a spectrum from right (valid) to wrong (invalid) which means that it is up to the individual to decide what is right or wrong for them. A worldview that seeks to define everything in a binary space will always lack the critical thought it takes to see people as complex mammals whose genetic and experiential differences transcend our ability to fully understand each other. >

What the OP gets wrong is failing to separate feelings and emotions from the actions one takes due to those feelings and emotions. >

"Feelings are valid" means roughly "You shouldn't feel bad or stupid for how you feel"
It's used as a counter to the sentiment that you should be happy for what you have and are being ungrateful if you aren't happy. >


"Feelings are valid" means roughly "You shouldn't feel bad or stupid for how you feel"

But aren't there feelings that should make you feel bad about yourself? Like when your emotional kneejerk reaction was petty, selfish, arrogant - anytime your emotions speak to your own character in a negative way. 
Thats not to propose hating yourself over it - but you should still critically engage with your own feelings and not tell yourself it's okay to, say, delight in someones misfortune or pain. If you find yourself feeling that way, you should feel bad.