Why do you have to fry vegetables? Are all Continental Europeans incapable of cooking any other way?
You're assuming that one person in a family is representative of over 60 million.
Some are better steamed for tenderness and texture, like beetroot, courgette, potatoes, baby sweetcorn, cauliflower or Swede, some are better wilted like spinach or chard, some are better lightly cooked in boiling water, like beans.
You've also got different culinary traditions from all over the world. That brings in combination methods - wilting the greens of pak choi or choi sum, the stem parts being boiled/steamed in liquid from the rest of the dish, blanching asparagus, wrapping ingredients in paper so that they steam, making potstickers so the bottom is browned but the rest is steamed with water, poaching meat so it is cooked but tender and not browned - the alternatives are extensive.
You're being ridiculous because you've met one person who cooks like that and their family is used to it.