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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.
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?