Of course the info you refer to is easy to find with a Google search, but you're missing the point. The point is, there is a burden of proof when an argument is being made. The person who makes a claim is responsible for providing the evidence to support their claim. When you say "porn is bad/porn does X", that's you making a claim, and therefore you bear the burden of proof. That means that you are responsible for providing the evidence, not telling people to go find it for themselves. You'll find people are unwilling to engage with you because by ignoring the burden of proof that is firmly on your shoulders, you show that you are not willing to engage in discussion in good faith. Furthermore, when people have good evidence to support their claims they tend to offer it, while people who don't have anything real to back up what they say tend to jump to the "I shouldn't have to educate you" line.

So if you really want to know why people ask you for sources, dismiss you or seem otherwise unwilling to engage, its because you're ignoring the rules of argumentation that dictate who has burden of proof. Someone who claims to be as smart as you should know that.