I decided to wave at no one. Even if they waved at me I looked ahead and focused on my pace. I didn't worry about if I waved and they didn't wave back, I didn't care if I waved and they nodded. I didn't try to determine if they were likely to wave upon approaching them.
It was great. I had such a better experience. In the future, I will not wave unless I know or recognize you.
To 'look ahead and focus on your pace' while riding on the MUP is a good start. Next up: retrieving, drinking from, and replacing your water bottle while 'looking ahead and focussing on your pace' without going over the centre line, snarling a dog leash, or knocking a three-year old off her trike.
Once you have mastered these skills, you are ready to enter a Category 6 'race'.