Tomato is a fruit
In botany, sure. So are Peppers, Beans, Peapods, Avocado, Squash, Zucchini, Cucumbers, Olives, Corn Kernels, Pumpkins & Nuts.
In culinary terms, though, most of these are vegetables - none of them are fruit. Mostly because none of these are sweet in the same way as fruit. I think tomatoes get brought up because their sweetness ranges between "vegetables" and "fruit".