Many people rely on plugins. Whether it's a good thing or not is another debate. Fortunately, most modern WP sites don't load jQuery on the front, but that's not rare, though.
For further actions, you may consider blocking this person and/or reporting abuse
We're a place where coders share, stay up-to-date and grow their careers.
Using wordpress is not a good reason to use jquery. It's easily removed from the frontend assuming you don't rely on plugins for your ux.
Many people rely on plugins. Whether it's a good thing or not is another debate. Fortunately, most modern WP sites don't load jQuery on the front, but that's not rare, though.