Why do people feel the need to attack small businesses over pricing?

I run a small handmade business and I try to price my items fairly… if anything, I’m on the cheaper side. Most of my buyers are 18–28 so I get that money can be tight. But here’s the thing… I don’t FORCE anyone to buy anything! It’s art! Either it’s worth it to you or it’s not. And that’s okay. What’s not okay is people writing long comments under my videos explaining why my work “isn’t worth it” mocking / assuming my materials or saying they’ll copy it themselves. I’m literally just sharing something I made. No one is making anyone buy it. Why do they waste time tearing someone down for putting themselves out there? I’m now deleting all negative comments but man some comments really get to me, because I put so much effort into my art and it just makes me feel like I’m not worth it or something :( Does anyone have some advice how to toughen up ?