3
Drivers who don't understand the concept and rules of merging. If you are entering the highway, your only two choices are to speed up faster than me to merge in front with enough room or to slow down enough to merge behind me as I pass. There is not an option to wait until you almost run out of lane and then expect to cut in front of me at the last minute and that I will slow down or change lanes to let you in. Not unless you want to become part of the guardrail that is.
Websites that insist on a mobile phone number for ID verification.
YouTube is the latest one I've stopped signing in to.