If you're running your open source project or other hobby endeavor, you can do it however you want. People will either adapt to your style or leave. The same, with some caveats, applies to running your own company (the caveats being lawsuits and needless drama if you take it too far).

But if you're a line employee for a corporation, this is the wrong approach, for two reasons. First, you will encounter many people who misinterpret directness as hostility, simply because your feelings toward another person are hard to convey in a chat message unless you include all that social-glue small talk. And if people on average think you're a jerk, they will either avoid you or reflexively push back.

But second... you're not that brilliant. Every now and then, the thing you think is wrong isn't actually wrong, you just don't understand why your solution was rejected beforehand. Maybe there are business requirements you don't know about, maybe things break in a different way if you make the change. Asking "hey, help me understand why this thing is the way it is" is often a better opener than "yo dude, your thing is broken, here's what you need to do, fix it now".