It's a redundant sentence. It should be "You're welcome" or "You're very welcome" "You're very so welcome" is wrong in structure and it's redundant. It should be "You're so very welcome". However, that is redundant as well...but at least that would be structured properly.

It’s not. “You’re so very welcome” would be more acceptable.

Sorry, kid, we're not going to do your grammar homework for you.

Of course they make fun of you -- you sound like Yoda. Besides the awkward word order, it sounds like an insincere (or even sarcastic) exaggeration. If the person said "thank you very much," your reply seems like you're making fun of the person's excessive gratitude. Just say "you're welcome" and be done with it, Timmy.

You can use "so" to intensify "very," but you can't intensify "so" with "very."

Well your fml was published so now you can have hundreds of people tell you you’re wrongXD

To start with the words are messed up in their order. If you had stated "You're so very welcome" it would be a start although either the so or the very is redundant as "very welcome" or "so welcome" would be better.

well it just sounds stupid. sorry.

Just type it in Microsoft Word. That will show up any grammar mistakes.

By any chance do you think life is like a box of chocolates?