There’s no need to be harsh. It takes a lot of bravery for people to put things here under the Show HN tag and for all you know this was something that took a lot of effort and hard work to achieve. Maybe you don’t find it useful but others might. If not I’d suggest keep scrolling or give positive or constructive feedback to the OP.
What a sad comment. There are all kinds of people here and I'm sure not all of them are web developers. Computer science alone is an extremely vast field with many different disciplines and I'm sure that is not the only background people on here have.
Please don't discourage people from sharing and showcasing something that may be interesting to someone other than yourself.
Are we supposed to care whether you're impressed or not?