You could just set up a (persistent) static route for those IPs to a junk (non-existant gateway).
- Open an elevated command prompt (run CMD, right click on "command prompt" and select "run as administrator")
- At the prompt type: route add -P [ipaddress to block] MASK [subnet mask to designate range to block] 192.168.137.253 [or any other junk ip address]
That will make prevent your computer from sending any network traffic to any computer in the range you specify with the IP address and subnet mask.
In theory they could still send traffic to you, but without a successful response, they won't be able to access any services running on your computer. Your computer has no way of communicating with those devices.
It's a bit of hack...