Is it weird to respond to "See you tomorrow" with "See you tomorrow too"?

It's not weird, per se, it is uncommon though. You'd do it alongside an affirmation of that plan and repeating it back to them for confirmation. You'd usually respond with the less context-giving phrase, like "see you!" or just "bye." You'd usually want to respond with acknowledgment or confirmation about that plan anyway, so "yeah, see you!" or "sounds good, bye."

Yes.

See you too.

If they say “see you tomorrow” you can respond with “you too”, that’s the most common way. When you say the whole sentence back it is usually for some reason, you’re mockingn the person, you don’t believe that it will happen, you’re weighing each word to see if it will happen… I dunno, many things can be interpreted when you repeat it all, especially if you say it in a specific tone. What is really weird is that you respond with “me too”, like you will see yourself tomorrow.

Yes, you would say “you too.”

It's fine, it's just a lot of words. The most common response you'd probably hear to "see you tomorrow" would be "yup."

It's not standard but I wouldn't think much of it if I heard it. Just repeating "see you tomorrow" is generally what people say, or some other type of goodbye

Yeah, the proper way to say it is "not if I see you first". 

"See you!" is pretty common.

No it’s not weird I reply back with “Okay!” But however u respond is how u respond not weird at all

Yes, it is. "Yeah, see you then!" would be my most likely response.

Usually I hear/say, “See ya!” In response. Or you could just say, “See you tomorrow” back . I wouldn’t add “too.”

i don’t love it but it’s not incorrect, necessarily, just sounds weird. what i’d respond with instead: -see you tomorrow! -see you! -see you then! -bye! -sounds good! (although that one’s in more of a formal context than a casual or friendly one)

It's a bit weird, yeah. Not super weird, but slightly odd. The more natural response is just "See you", or maybe "yep", or "Yeah, bye".

Yeah if someone says “see you tomorrow” I would say “see you tomorrow” or something like “yeah have a good night”

If you want to make a dad joke say “not if I see you first”

Just say “see you then”

I would say "see you then!" or "see you soon!" What you suggested sounds unnatural to me. The same applies for any time frame, not just "tomorrow."

"See you then!" Or "you too!" Sounds a bit more natural, if the context, in this example 'tomorrow', has already been established it's usually pretty common to omit it So a reply like "see you tomorrow too!" Ends up being shortened to "see you too!" Or "you too", it being implied the 'when' you mean is the already established subject 'Tomorrow' by the first persons sentence. (Sorry if this is phrased weird, I'm a native speaker so trying to articulate things I do by defaults a little odd lol, still figuring it out)

It does sound a *bit* wierd. A more normal answer: "See you."

I'd probably just say, "You too!"

I'd just say 'you too!', but as others have said, it's also common to repeat it verbatim or just acknowledge it like 'For sure!' or 'Yeah!'

Thank you for your responses!

You can also say, "See you then." That's pretty common when someone specifies a time that they will see you again.

I think it's more normal to just repeat it back to them. "See you tomorrow!" "See you tomorrow!" This can also be used as a chance to correct expectations, rather than just a way to say goodbye. "See you tomorrow!" "No. Remember? I'm not going to the party. I'll see you on Monday." "Oh, right. Well, see you Monday." "See you Monday."