There are a couple I have in mind. Like many techies, I am a huge fan of RSS for content distribution and XMPP for federated communication.
The really niche one I like is S-expressions as a data format and configuration in place of json, yaml, toml, etc.
I am a big fan of Plaintext formats, although I wish markdown had a few more features like tables.
The metric system, f*ck the imperial system. Every scientist sticks to the metric system, and why are people even still having an imperial system, with outdated measurements like stones for weight blows my mind.
Also f*ck Fahrenheit, we have Celsius and Kalvin for that, we don’t need another hard to convert temperature measurement.