As a web developer, I'm actually quite fine with this. Considering your family members probably fall under the "potential IE users" category.
And honestly, your reply was childish and and a bit douche-bag-ish.
There's no need for this here - (I assume) we're all adults, and don't need to resort to playground tactics.
(If you actually are under 16, then I take the above and I'm sorry - welcome to HN!)