One option if you (and no one else who uses your computer) ever intends to use that site, would be to create a black hole host table entry. What that does is forces your computer to resolve that DNS entry to an alternate IP address (like localhost/127.0.0.1). Since the IP address is not correct, attempts to access that site would fail and prevent your computer from loading any content.
Note: Make sure you use an IP address that doesn't have a different web server or you may accidentally load content from that site. Localhost is usually a safe bet unless you're running your own server.
https://www.imore.com/how-edit-your-macs-hosts-file-and-why-you-would-want
Open a Finder window. Select Applications from the sidebar.
Open Finder, then click on Applications Double-click on Utilities.
Double-click Terminal.
Double-click on Utilities, then double-click on Terminal In the
Terminal window, you will need to enter a command to open the Nano
text editor. You will need your administrator password, as well.
type sudo nano /etc/hosts and then hit return. Enter your
administrator password and then hit return.
Enter enter Nano Text Editor in Terminal You're now in the Nano text
editor.
Map the IP address in the Nano text editor If you want to add a new
device or domain, move the cursor using the arrow keys and position it
after the text in the window. Then, begin typing.
If you're mapping a particular IP address on your local network to a
domain, you can type the IP address, hit tab, then type the domain
name.
Conversely, if you'd like to make sure a web URL doesn't go to its
intended site — if you're trying to keep your Mac away from certain
sites, use "127.0.0.1." That'll map it back to your Mac. Even if your
Mac is assigned a different IP address by its router, 127.0.0.1
defaults to the local machine thanks to the default settings in that
hose file.
Once you're done, hold down the control and O keys to save the file,
then control and X to exit.
One last step Back at the command line, type sudo killall -HUP
mDNSResponder then type return. That will flush your Mac's DNS cache,
so it doesn't get confused by any changes you've made to the Hosts
file.