I say argue your point and offer proof. Not that it's important to always be right, but if someone is berating you for lying about something that is a simple fact, I say stand your ground!

fruits, vegetables... you know... to-may-to, to-mah-to

Watermelon is botanically a vegetable.

"Technically" a fruit. A fruit is a fruit, nothing really technical about that logic.

Also black and white aren't really colours as you can't make them with any products of the 3 primary colours :p

This sounds like something MY grandma would do if I told her it was a veggie

There's a lot of vegetables that are fruits. Tomatoes, all varieties of squash, cucumbers; really, anything that grows on the plant above ground and isn't a leaf or seed pod. This includes all forms of berries. Just because something is a fruit doesn't mean it's not a vegetable. In fact, in a biological sense, all fruits are, by definition, vegetables.

I honestly find it hard to believe that tomatoes are fruit though.

so what? shes getting anything through a straw soon anyway. no matter if its fruit or vegetable

It's ok we all know the truth, that its a fruitable.